72 SERIES 72 Series - Monitoring relays Features 72.01 72.11 Level control relays for conductive liquids 72.01 - Adjustable sensitivity 72.11 - Fixed sensitivity Emptying or filling functions LED indicator * Reinforced insulation (6 kV - 1.2/50 s) between: - supply and contacts - electrodes and supply - contacts and electrodes * 35 mm rail (EN 60715) mount * Control about a single level or between Min./Max. limits * 72.01 available also for supply 400 V * 72.01 available also with sensitivity range (5...450) k adjustable * 72.01 available also for contact loads down to 5 V 1 mA * * * * * Sensitivity range (5...150) k adjustable Delay time (0.5s or 7s) switch selectable Emptying or filling functions switch selectable * * * Sensitivity fixed 150 k Delay time fixed: 1s Emptying or filling functions link selectable U = 24 V DC 24 V AC 50/60 Hz (110...125)V AC 50/60 Hz (230...240)V AC 50/60 Hz 72.01/11 Screw terminal U = 24 V DC 24 V AC 50/60 Hz (110...125)V AC 50/60 Hz (230...240)V AC 50/60 Hz F = Filling E E = Emptying FOR UL RATINGS SEE: "General technical information" page V FL = Filing - 7s delay FS = Filling - 0.5s delay ES = Emptying - 0.5s delay EL = Emptying - 7s delay For outline drawing see page 8 Contact specification Contact configuration Rated current/Maximum peak current 1 CO (SPDT) 1 CO (SPDT) 16/30 16/30 250/400 250/400 4,000 4,000 A Rated voltage/Maximum switching voltage V AC Rated load AC1 VA Rated load AC15 (230 V AC) Single phase motor rating (230 V AC) Breaking capacity DC1: 30/110/220 V Minimum switching load VA 750 750 kW 0.55 0.55 16/0.3/0.12 16/0.3/0.12 500 (10/5) 500 (10/5) AgCdO AgCdO A mW (V/mA) Standard contact material Supply specification Nominal voltage (UN) V AC (50/60 Hz) 24 V DC 24 Rated power AC/DC VA (50 Hz)/W Operating range 110...125 230...240 -- -- 400 24 -- 24 2.5/1.5 -- 230...240 -- -- 2.5/1.5 V AC (50/60 Hz) 19.2...26.4 90...130 184...253 360...460 V DC 20.4...26.4 110...125 -- -- 19.2...26.4 90...130 184...253 20.4...26.4 -- -- Technical data Electrical life at rated load AC1 cycles Electrode voltage V AC Electrode current mA III-2014, www.findernet.com Run-on time Max sensitivity range s k Insulation between supply/contacts/electrode (1.2/50 s) kV Ambient temperature Protection category C 100 * 103 100 * 103 4 4 0.2 0.2 0.5 - 7 (selectable) 1 5...150 (adjustable) 150 (fixed) 6 6 -20...+60 -20...+60 IP20 IP20 Approvals (according to type) 1 72 SERIES 72 Series - Monitoring relays Features 72.42 Priority change relay Special relay for alternating loads, for applications with pumps, compressors, air conditioning or refrigeration units 2 independent NO output, 12 A 4 functions * 2 independent control signals, insulated from supply * 110...240 V and 24 V AC/DC supply versions * Modular housing, 35 mm wide * 35 mm rail (EN 60715) mount * Cd-free contact material * * * Multi-function (MI, ME, M2, M1) 72.42 Screw terminal E For outline drawing see page 8 Contact specification Contact configuration 2 NO (2 DPST-NO) Rated current / Max. peak current A 12 / 20 Rated voltage / Max. switching voltage V AC Rated load AC1 Rated load AC15 Single phase motor rating (230 V AC) Breaking capacity DC1: 30/110/220 V Minimum switching load 250 / 400 VA 3,000 VA 1,000 kW 0.55 A 12 / 0.3 / 0.12 mW (V/mA) 300 (5 / 5) Standard contact material AgNi Supply specification Nominal voltage (UN) V AC (50/60 Hz) / DC Rated power in stand-by W with 2 active relays W/VA(50 Hz) Operating range V AC (50/60 Hz) V DC 24 110 ... 240 0.12 0.18 1.1 / 1.7 1.5 / 3.9 16.8...28.8 90...264 16.8...32 90...264 Technical data cycles 100 x 103 Output delay time (T on function diagrams) s 0.2...20 Power-on activation time s 0.7 Minimum impulse duration ms Insulation between supply and contacts (1.2/50 s) kV Dielectric strength between open contacts Ambient temperature Protection category Approvals (according to type) 2 V AC C 50 6 1,000 -20...+50 IP20 III-2014, www.findernet.com Electrical life at rated load AC1 72 SERIES 72 Series - Monitoring relays Ordering information Example: 72 series level control relay, adjustable sensitivity range, (230...240)V AC supply voltage. 7 2 . 0 Series Type 0 = Level control relay, sensitivity range adjustable (5...150)k 1 = Level control relay, sensitivity fixed 150 k 4 = Priority change relay No. of poles 1 = 1 CO (SPDT) 2 = 2 NO (DPST-NO) 1 . 8 . 2 4 0 . 0 0 0 0 Contact material 0 = Standard AgCdO for 72.01/72.11, AgNi for 72.42 5 = AgNi + Au** Supply voltage 024 = 24 V 125 = (110...125)V AC 230 = (110 ... 240) V 240 = (230...240)V AC 400 = 400 V AC (72.01 only) Option 0 = Max. 150 k 2 = Sensitivity range adjustable (5...450) k types 72.01.8.024.0002* 72.01.8.240.0002* 72.01.8.240.5002** Supply version 0 = DC / AC (50/60 Hz) 8 = AC (50/60 Hz) 9 = DC All versions 72.01.8.024.0000 72.01.8.024.0002* 72.01.8.125.0000 72.01.8.240.0000 72.01.8.240.0002* 72.01.8.240.5002** 72.01.8.400.0000 72.01.9.024.0000 72.11.8.024.0000 72.11.8.125.0000 72.11.8.240.0000 72.11.9.024.0000 72.42.0.230.0000 72.42.0.024.0000 E III-2014, www.findernet.com * For liquids conductivity up to 2 Siemens or a Resistance of 450 k ** For applications with output contact loading down to 5 V 1 mA 3 72 SERIES 72 Series - Monitoring relays Technical data Insulation 72.01/72.11 Insulation Dielectric strength 72.42 Impulse (1.2/50 s) between supply and contacts 4,000 V AC 6 kV 6 kV between supply and control (for 110...240 V version only) 2,500 V AC -- 4 kV between electrodes, Z1-Z2 and supply* 4,000 V AC 6 kV -- between contacts and electrodes 4,000 V AC 6 kV -- between open contacts 1,000 V AC 1.5 kV 1.5 kV EMC specifications Type of test Electrostatic discharge Radio-frequency electromagnetic field 72.01/72.11 72.42 EN 61000-4-2 4 kV 4 kV air discharge EN 61000-4-2 8 kV 8 kV (80...1,000 MHz) EN 61000-4-3 10 V/m (1...2.8 GHz) EN 61000-4-3 -- Fast transients on supply terminals EN 61000-4-4 4 kV 4 kV (burst 5/50 ns, 5 and 100 kHz) on control terminals EN 61000-4-4 -- 4 kV Voltage pulses on supply terminals common mode EN 61000-4-5 4 kV 4 kV (surge 1.2/50 s) differential mode EN 61000-4-5 4 kV 4 kV Radiofrequency common mode on supply terminals EN 61000-4-6 10 V 10 V (0.15...230 MHz) voltage (0.15...280 MHz) on control terminals EN 61000-4-6 -- 10 V Voltage dips 70 % UN EN 61000-4-11 -- 25 cycles EN 61000-4-11 -- 1 cycles Short interruptions 10 V/m 5 V/m Radiofrequency conducted emissions (0.15...30 MHz) CISPR 11 class B class B Radiated emissions (30...1,000 MHz) CISPR 11 class B class B Terminals Screw torque Nm 0.8 Wire strip length mm 9 Max. wire size mm2 AWG solid cable stranded cable 1x6 / 2x4 1x4 / 2x2.5 1x10 / 2x12 1x12 / 2x14 Other data Current absorption on Z1 and Z2 (type 72.11) mA Current absorption on control signal (B1-B3 and B2-B3) <1 5 mA, 5 V 72.01/72.11 Power lost to the environment 72.42 without contact current W 1.5 0.9 (1 relay ON) with rated current W 3.2 3.0 (2 relays ON) Max cable length between electrode and relay (types 72.01/72.11) m 200 (max. capacitance of 100 nF/km) * There is no electrical isolation between electrodes and supply voltage for the 24 V DC types (72.x1.9.024.0000). Therefore, for SELV applications it would be necessary to use a SELV (non-grounded) power supply. In the case of a PELV (grounded) power supply take care to protect the level control relay against harmful circulating currents by ensuring that no electrodes are grounded. However, there is no such problem for the 24 V AC types (72.x1.8.024.0000) which, by virtue of an internal isolating transformer, assure reinforced isolation between electrodes and supply. III-2014, www.findernet.com E Reference standard contact discharge 4 72 SERIES 72 Series - Monitoring relays Functions for 72.01 and 72.11 U = Supply voltage B1 = Max level electrode B2 B3 Contacts Supply voltage NO output contact Open Closed = Min level electrode OFF Open 11 - 14 11 - 12 = Common ON Open 11 - 14 11 - 12 ON Open (Timing in Progress) 11 - 14 11 - 12 ON Closed 11 - 12 11 - 14 LED = Contact 11-14 Z1-Z2 = Link to select emptying (Type 72.11) Function and Run-on time Type 72.01 FL = Level control by Filling, Long (7sec) run-on delay. FS = Level control by Filling, Short (0.5sec) run-on delay. ES = Level control by Emptying, Short (0.5sec) run-on delay. EL = Level control by Emptying, Long (7sec) run-on delay. Type 72.11 F = Level control by Filling, Z1-Z2 open. Run-on time fixed at 1sec. E = Level control by Emptying, Z1-Z2 linked. Run-on time fixed at 1sec. Filling functions Wiring diagram Type 72.01 U = 24 V DC 24 V AC 50/60 Hz (110...125)V AC 50/60 Hz (230...240)V AC 50/60 Hz Level Filling Control - between Min. and Max. levels. Under normal operation the liquid level can be expected to cycle between the Minimum and the Maximum electrodes, B2 and B1 (plus a degree of over and under-shoot). Switch On: * On "power-up", if the liquid is below B1 the output relay will operate after time T has expired. * On the liquid level falling below B2, the output relay will operate after time T has expired. Type 72.11 Switch Off: * On the liquid level reaching electrode B1, the output relay will de-energise after time T has expired. * On "power-off", the output relay will immediately de-energise. F = Filling Wiring diagram Examples with 2 electrodes Type 72.01 U = 24 V DC 24 V AC 50/60 Hz (110...125)V AC 50/60 Hz (230...240)V AC 50/60 Hz Level Filling Control - about a single level, B1. Under normal operation the liquid evel can be expected to cycle about the level set by electrode B1 with a degree of over and under-shoot. Switch On: * On "power-up", if the liquid is below B1 the output relay will operate after time T has expired. * On the liquid level falling below B1, the output relay will operate after time T has expired. Type 72.11 III-2014, www.findernet.com E Examples with 3 electrodes F = Filling Switch Off: * On the liquid level reaching electrode B1, the output relay will de-energise after time T has expired. * On "power-off", the output relay will immediately de-energise. 5 72 SERIES 72 Series - Monitoring relays Emptying functions Wiring diagram Examples with 3 electrodes Emptying Control - between Max. and Min. levels. Under normal operation the liquid level can be expected to cycle between the Maximum and the Minimum electrodes, B1 and B2 (plus a degree of over and under-shoot). Type 72.01 U = 24 V DC 24 V AC 50/60 Hz (110...125)V AC 50/60 Hz (230...240)V AC 50/60 Hz Level Switch On: * On "power-up", if the liquid level is above B2 the output relay will operate after time T has expired. * On the liquid level rising to B1, the output relay will operate after time T has expired. Type 72.11 E = Emptying Wiring diagram Examples with 2 electrodes Type 72.01 Emptying Control about a single level, B1. Under normal operation the liquid level can be expected to cycle about the level set by electrode B1 with a degree of over and under-shoot. U = 24 V DC 24 V AC 50/60 Hz (110...125)V AC 50/60 Hz (230...240)V AC 50/60 Hz Level Switch On: * On "power-up", if the liquid is above B1 the output relay will operate after time T has expired. * On the liquid level rising to B1, the output relay will operate after time T has expired. Type 72.11 Switch Off: * On the liquid level falling below electrode B1, the output relay will de-energise after time T has expired. * On "power-off", the output relay will immediately de-energ E = Emptying Applications for 72.01 and 72.11 FILLING function: Examples with 3 electrodes and with a contactor connected to the contact. EMPTYING function: Examples with 3 electrodes and with a motor pump connected directly to the contact. The 72 series level control relays work by measuring the resistance through the liquid, between the common (B3) electrode and Min. and Max. electrodes (B2 and B1). If the tank is metalic, then this can be substituted as the B3 electrode. Take care to ensure that the liquid has a suitable resistivity - see below: SUITABLE LIQUIDS - City water - Well water - Rainwater - Sea water - Liquids with low-percentage alcohol - Wine - Milk, Beer, Coffee - Sewage - Liquids fertilizer UN-SUITABLE LIQUIDS - Demineralised water - Fuels - Oil - Liquids with high-percentage alcohol - Liquid gas - Paraffins - Ethylene glycol - Paint 6 III-2014, www.findernet.com E Switch Off: * On the liquid level falling below electrode B2, the output relay will de-energise after time T has expired. * On "power-off", the output relay will immediately de-energise. 72 Series - Monitoring relays 72 SERIES Functions for 72.42 A1-A2 = Supply voltage S1 (B1-B2) = Control signal 1 S2 (B3-B2) = Control signal 2 LED Device in stand-by, output not activated = Contact 1 (11-14) and Contact 2 (21-24) LED 1 = Output 1 LED 2 = Output 2 Output not activated, timing in progress Output not activated (only functions M1/M2) Output activated Wiring diagram (MI) Outputs alternate on successive applications of supply voltage * Application of the supply voltage to A1-A2 forces just one output contact to close, but the contact that closes will alternate between 11-14 and 21-24 on each successive application of the supply - ensuring even wear across both motors. * The other output contact can be forced closed by the closure of either S1 or S2 - but to limit high current surges the other motor cannot start within T seconds of the first motor. (ME) Outputs alternate according to control signal * The supply voltage is permanently applied to A1-A2. When closed, S1 forces just one output contact to close. The contact that closes will alternate between 11-14 and 21-24 on each successive S1 closure ensuring even wear across both motors. * If closed, S2 forces both output contacts to close (irrespective of S1). However, to limit high current surges, both motors cannot start within T seconds of each other. (M2) Output 2 (21-24) only * Supply permanently applied to A1-A2. * Closure of either S1 or S2 will close output contact 2 (21-24). Use when load 1 (11-14) is out of service. III-2014, www.findernet.com (M1) Output 1 (11-14) only * Supply permanently applied to A1-A2. * Closure of either S1 or S2 will close output contact 1 (11-14). Use when load 2 (21-24) is out of service. 7 E 72 SERIES 72 Series - Monitoring relays MI function example This shows the 72.42 Priority change relay working in conjunction with a single 72.01 level controller. Under normal conditions the liquid level is expected to remain within the range shown as Min to Max. In this case the function of the 72.42 will be to alternate the duty between both pumps, to even wear across both pumps. There is no provision to run both pumps simultaneously. ME function example This shows the 72.42 Priority change relay working in conjunction with two 72.01 level controllers. Under normal conditions the liquid level is expected to remain within the range shown as Min to Max. In this case the function of the 72.42 will be to alternate the duty between both pumps, to even wear across both pumps. Should the liquid level rise above the Alarm level then the function of the 72.42 will call for the simultaneous operation of both pumps, by virtue of the signal to terminal B3 from the Alarm/Low level controller. Note: due to the low level of 72.42 control signals, it is suggested to use level controller 72.01.8.240.5002 because of its superior low load switching capability. Outline drawings 72.01/11 Screw terminal 72.42 Screw terminal III-2014, www.findernet.com E 8 72 SERIES 72 Series - Monitoring relays Accessories for 72.01 and 72.11 Suspended electrode for conductive liquids, complete with cable. Suitable for level monitoring in wells and reservoirs not under pressure. Order appropriate number of electrodes - additional to the relay. *Electrode compatible with food processing applications (according to European Directive 2002/72 and cod. FDA title 21 part 177): 072.01.06 Cable length: 6 m (1.5 mm2) 072.01.06 2 Cable length: 15 m (1.5 mm ) 072.01.15 * Electrode for swimming pools with high levels of chlorine, or in salt-water pools with high levels of salinity: Cable length: 6 m (1.5 mm2) 072.02.06 Technical data 072.02.06 Max. liquid temperature Electrode material C +100 stainless steel (AISI 316L) E Suspended electrode Order appropriate number of electrodes additional to the relay. 072.31 Technical data Max liquid temperature Cable grip Electrode material 072.31 Max screw torque Max. wire size C + 80 mm O 3...6 stainless steel (AISI 316L) Nm 0.7 mm2 1 x 2.5 AWG 1 x 14 mm 9 III-2014, www.findernet.com Wire strip length 9 72 SERIES 72 Series - Monitoring relays Accessories for 72.01 and 72.11 Floor water sensor, designed for the detection and reporting of the presence of floor surface water. 072.11 Technical data Electrode material stainless steel (AISI 301) Wire capability of terminals Max screw torque 072.11 Nm Max. wire size mm2 AWG Wire strip length mm 0.8 solid cable stranded cable 1x6/2x6 1x6/2x4 1 x 10 / 2 x 10 1 x 10 / 2 x 12 9 Other data Distance between electrodes and floor mm Floor fixing screw diameter Maximum cable diameter 1 Maximum M5 mm Maximum length of cable connecting sensor to relay m C Max. liquid temperature 10 200 (with capacitance of 100 nF/km) +100 Floor surface water sensor for connection to electrode terminals (B1 and B3) of 72.01 or 72.11 level control relay, set in Emptying function (ES or E respectively). E For ice bank control in refrigeration systems it is suggested to use the high sensitivity (5...450kOhm) types - 72.01.8.024.0002 or 72.01.8.230.0002. Function Z1, Z2 only for types 72.11 Electrode holder with two pole connector, one connected directly to the electrode and the second connected to the grounded installation thread. Suitable for metal tank with G3/8" linkage. Electrode not incuded. Order appropriate number of electrodes holders - additional to the relay. 072.51 Technical data 072.51 Max liquid temperature C + 100 Max tank pressure bar 12 Cable grip mm O 6 stainless steel (AISI 304) III-2014, www.findernet.com Electrode material 10 72 SERIES 72 Series - Monitoring relays Accessories for 72.01 and 72.11 Electrode holder with three poles. Electrode not incuded. Order appropriate number of electrodes holders - additional to the relay. 072.53 Technical data Max liquid temperature 072.53 Electrode material C + 130 stainless steel (AISI 303) Electrode and electrode connector, multiple electrodes may be interconneced to provide required length E Technical data 072.500 Electrode - 500 mm long, M4 thread, stainless steel (AISI 303) 072.500 Inter-electrode connector - M4 thread, stainless steel (AISI 303) 072.501 Illustration of interconnection of electrodes. 072.501 Electrode separator 072.503 Adaptor for panel mounting, plastic, 35 mm wide 011.01 Sheet of marker tags, plastic, 72 tags, 6 x 12 mm (for 72.42 only) 060.72 Identification tag, plastic, 1 tag, 17 x 25.5 mm (for 72.42 only) 019.01 072.503 011.01 III-2014, www.findernet.com 060.72 019.01 11 72 SERIES 72 Series - Monitoring relays Application notes for 72.01 and 72.11 Applications The main application for these relays is for the sensing and control of the level of conductive liquids. Selectable options allow for this control to be achieved either through a filling operation or through an emptying operation, and in either case "positive logic" is used. Level control can be achieved around a single level - using 2 electrodes, or between Minimum and Maximum levels - using 3 electrodes. Additionally, the 72.01, with its adjustable sensitivity setting, can be ideal for monitoring the conductivity of liquids. Positive safety logic These relays work according to the principle that it is the closure of a normally open output contact that will be used to control the pump, both in filling and emptying applications. Consequently, in the event of a failure of the supply local to the relay, the filling or emptying will cease. This is generally considered to be the safest option. Prevent dry running of pump on emptying Care must be exercised to ensure that the pump cannot run dry. Similar considerations must be given as outlined above. In particular, keeping the run-on time delay to a minimum will minimise the risk, but again, it will increase the installed switching rate. Run-on time In commercial and light industrial applications the use of a short Run-on time delay is more appropriate, due to the relatively small size of tanks and the consequential need to react quickly to the change in level. Larger scale industrial applications involving larger tanks and powerful pumps must avoid a frequent switching cycle, and the use of the 72.01 set for the longer Run-on time of 7 seconds is suggested. Note that the short run-on time will always achieve closer control to the desired level(s), but at the cost of more frequent switching. Electrical life of the output contact The electrical life of the output contact will be enhanced where a larger distance between the Max. and Min. electrodes (3-electrode control) can be realised. A smaller distance, or level control to a single level (2-electrode control), will result in more frequent switching and therefore a shorter electrical life for the contacts. Similarly, the long run-on time will enhance, and the short time will reduce, electrical life. Pump control Small single-phase pumps within the kW (0.55 kW - 230 V AC) rating stated may be driven directly by the level relay output contact. However, where very frequent switching is envisaged, it is better to "slave" a higher power relay or contactor to drive the pump motor. Large pumps (singlephase and three-phase) will of course require an interposing contactor. Electrode choice The choice of electrodes may depend on the liquid being monitored. Standard electrodes 072.01.06 and 072.51 are suitable for many applications but some liquids may be corrosive for example, and may therefore require custom made electrodes - but these can usually be used with the 72.01 and 72.11 relays. On site commissioning To confirm the suitability of the relay sensitivity to the resistance between electrodes it is suggested that the following checks are made. For convenience it is suggested that the fill function and the shortest run-on time are selected. Commissioning Follow these setting-up instructions to achieve correct operation: 72.01 Select the function "FS" (Filling and Short delay of 0.5 s), and set the sensitivity control to 5 k. Ensure that all electrodes are immersed in the liquid - expect the output relay to be ON. Then, slowly rotate the sensitivity control in the 150 k direction until the level relay switches OFF (internal output relay will switch OFF and red LED will switch slowly flash). (If the level relay does not switch OFF then, either the electrodes are not immersed, or the liquid has too high impedance or the distance between electrodes is too long). Finally, select the filling or emptying function as required, run in real time and confirm that the level relay works as required. 72.11 Select the Filling function "F", (Z1 - Z2 open). Ensure that all electrodes are immersed in the liquid, but leave electrode B3 disconnected - output relay should be ON. Connect electrode B3, and the level relay should switch OFF (internal output relay will switch OFF and red LED will switch slowly flash). (If the level relay does not switch OFF then, either the electrodes are not immersed, or the liquid has too high impedance or the distance between electrodes is too long.) Finally, select the filling or emptying function as required, run in real time and confirm that the level relay works as required. Water leakage and condensation in oil lubrication systems To detect condensed water vapour or water leakage within lubricating systems, monitor by sensors connected to B1 - B3 (Function E or ES, Z1 - Z2 linked). Condensed water vapour has low conductivity, therefore choose monitoring relay type 72.01.8.240.0002 with sensitivity range of (5...450) kOhm and sensor type 072.11. Floor flooding control To detect floor water due to spills or flooding, monitor using sensors connected to B1 - B3 (Function E or ES, Z1 - Z2 linked). Choose monitoring relay type 72.01.8.240.0000 or 72.11.8.240.0000, together with floor water sensor type 072.11. 12 III-2014, www.findernet.com E Overrunning of tank on filling Care must be exercised to ensure that the tank cannot overrun. Factors that have to be considered are the pump performance, the rate of discharge from the tank, the position of the single level electrode (or maximum electrode), and the run-on time delay. Keeping the time delay to a minimum will minimise the possibility of tank overrun, but will increase the installed switching rate. Electrodes and cable lengths Normally 2 electrodes or 3 electrodes will be required for control about a single level, or control between Min. and Max. levels, respectively. However, if the tank is made of conductive material it is possible to use this as the common electrode, B3, if electrical connection can be made to it. The maximum permitted length of cable between the electrode and the relays is 200m, for a cable not exceeding 100nF/km. A maximum of 2 relays and associated electrodes can be employed in the same tank - if two different levels need monitoring. Note: It is permitted to make direct electrical connection between terminals B1-B3, and B2-B3, (without using electrodes/liquid), but in this case it is not possible to set up the sensitivity.