DC Current/Voltage Alarms ADTECH Analog-Digital Technology, Inc. The Adtech DCA series alarms accept standard process DC current or DC voltage input signals and provide relay contact outputs. Model Nos. DCA 114 Single, DCA 115 Dual The basic input range is 1-50 mA (i.e., 4-20 mA), or any voltage of 0-1.25 mV DC to 0-250 VDC (i.e., 1-5 VDQ and output contacts are rated at 10 amps, 30 VDC, or 250 VAC resistive. They provide a cost-effective way of protecting equipment for over- and/or undercurrent or voltage conditions. The DCA 114 single alarm has a DPDT output. The DCA 115 dual alarm has a SPDT output per each setpoint. A 24 VDC at 35 mA DC output is provided as standard for loop transmitters. Integral dual color LEDs provide green indication for normal conditions and red indication on alarm per setpoint independent of relay coil power. The alarms are furnished as standard with the relay power fail-safe (i.e., relay coil energized) regardless of highand/br low-alarm configurations. You may specify the relays to be non-fail-safe (i.e., relay coil de-energized) or any combination at no extra cost. The DCA 114 and DCA 115 are supplied with a fixed dead band of 0.5% of span, as standard. They are optionally supplied with adjustable dead band of I to 100% of input span. Ten-turn calibrated dials are offered as an option for both the setpoint and dead band at a nominal extra cost and are mounted in the "wide-line" (2.75" wide) enclosure. An adjustable time delay of 1-30 seconds may also be provided as an option. This is useful to prevent false alarms due to signal transient noise-interference. Typical Applications *Limit detector of DC voltage/current inputs *Tank-filling applications with dead band feature *Contact inputs to annunciators, lights, and horns *High-/low-alarm or window monitor *Alarm and/or shutdown of process variables *Machine and process protection *On/off controller Features * DC Current Inputs: 1 mA to 50 mA DC: (i.e., 4-20 mA DC) * DC Voltage Inputs: 1.25 mV to 250 VDC: (i.e. 1-5 VDC) * High Input Impedance: 1.0 megohms minimum * Zero-Based Inputs: Current and voltage * Repeatability: 0.1 % of span * Universal Relay Action: Fail-safe or non-fail-safe for high and low trip * Contact Status: LED indication: green--normal; red--alarm * Adjustable Dead Band: 1-100% of input span--optional * Adjustable Time Delay: 1-30 seconds--optional * Calibrated Set Point and Dead Band: Ten turn--optional Connections/Dimensions Input/Output Input Signals *Any: 1 to 50 mA DC span (i.e., 4-20 mA DC--Z in 20 ohms) *Any: 1.25 mV to 250 VDC span (i.e., 1-5, 0-5, 0-10 VDC-Z in 1 megohm min.) *Zero suppression/elevation to 85% of span. Performance Power Mechanical Options Ordering Information * * * * * * * * Model number Model number Input signal High and/or low relay action Relay action, F.S. or non-F.S. Prime power with option no, Input/output/control(s) options Housing and miscellaneous options Please refer to the Housing and/or Option Section for more specific and detailed information. Output Signals Standard: DCA 114 one set DPDT contact** DCA 115 two SPDT contacts** ** Rated 10 amps at 30 VDC or 250 VAC resistive. 24 VDC at 35 mA DC two-wire transmitter excitation Optional: DPDT dual alarms: (Option O 34). Hermetically sealed 2 amp at 28 VDC or 115 VAC resistive: (Option O 40 single, Option O 41 dual) Note: With Option 0 34, the "wide-line" (2.75" wide) housing is supplied. Repeatability: 0.1 % of span Trip Point Stability: Zero and span 0.004%/F typical, 0.01%/F maximum for a 50F change from ambient * Trip Adjustment: 0-100% of span continuously adjustable; blind set: infinite resolution Fixed Dead Band: Factory set at 0.5% of span * Adjustable Dead Band: 1-100% of span continuously adjustable; blind set: infinite resolution Power Supply Effect: 0.05% for a 10% power variation Isolation: Input/output/power 1,500 VAC, 50/60 Hz, for AC & isolated DC powered units Response Time: Less than 200 milliseconds Temperature Range: 0 to 140F (-18 to 60C) operating; -40 to 185F (-40 to 85C) storage Note: All accuracies are given as a percentage of span. * Ten-turn dials: 0.5% accuracy, 0.05% resolution 115VAC: 50/60 Hz, 0.7PF (Standard) 48 VDC: Isolated 12 VDC: Isolated (Option P8) 125 VDC: Isolated (105-140 VDQ 24 VDC: Non-isolated (Option PI) 230 VAC: 50/60 Hz, 0.7 PF 24 VDC: Isolated (Option P2) Note: All units 3 watts maximum, and a 10% power variation unless noted. (Option P3) (Option P4) (Option P5) Electrical Classification: General purpose Connection: Barrier terminal strip (3/8" spacing, No. 6 screws) Controls: Multiturn trip set controls; optional time delay and dead band controls, and internal zero span controls Mounting: Surface mounting standard. See Housings Section for options. Weight: Net Unit: 2.6 pounds (1.18 kilograms); Shipping: 3.0 pounds (1.36 kilograms) Option Number O 26& O 28 O 27 & O 29 O 30 & O 31 O 34 O 40 & O 41 O 46S & O 46D H 10 & H 11 H 13B, H 14B, H 15B Represented by: Description Setpoint ten-turn calibrated dials: single and dual Dead band ten-turn calibrated dials: single and dual Adjustable time delay: single and dual DPDT output: dual Hermetically sealed relays: single and dual Adjustable blind set dead band: single and dual Thin- and wide-line conduit mounting plate and terminal cover NEMA 4, 7, and 12 enclosures Analog-Digital Technology, Inc. 3750 Monroe Avenue Pittsford, New York 14534-1302 Phone: (716) 383-8280 Fax: (716) 383-8386 Mail: adtech@adtech-inst.com ADTECH EWeb site: http://www.adtech-inst.com Information subject to change without notice. Printed in U.S.A. A092