T01102 001229 Thermocouple terminal blocks MTC 6 Thermocouple terminal blocks Spacing 6 mm .238" Compression clamp Entrelec's MTC 6 thermocouple terminal block provides an interface for connecting thermocouple wire with virtually no loss of signal integrity. The interface design ensures positive wire continuity and allows selection and inventory of one terminal block for all thermocouple material. DIN 1 - 3 6 mm block for thermocouple wires. End stop th. 9,1 mm BADL V0 0199 408.02 End stop th. 9,1 mm BAM 0103 002.26 Other end stops : See Accessories section Rail PR30 prepunched 0173 220.05 35 x 7,5 x 1 Rail 35 x 15 x 2,3 PR4 0168 500.12 Rail 35 x 15 x 1,5 PR5 prepunched 0101 598.26 Rail 32 x 15 PR1Z2 0163 050.04 Other rails : See Accessories section Grey body Figure 1. MTC 6 with shield connector When running extended or intermittent lengths of thermocouple wire, to a measurement instrument, two solutions are available : Type Block standard The thermocouple principle is based on the reaction of different metals to temperature. When thermocouple wires are terminated or connected, the "metal balance" must be maintained. The introduction of a foreign material (such as copper) results in loss of signal strength and integrity. Part number Type MTC 6 0115 206.22 1. When signals are carried over a long distance, a thermocouple transmitter signal, (mV), is Ref. is required. Type The thermocouple Ref. Type in millivoltsRef. converted to a milliampere (mA) signal (i.e. 4-20 mA) for ease of transmission. 2. When thermocouple wire is of insufficient length, termination and interconnection, using terminal blocks, will extend its length. Universal terminal block Other thermocouple terminal blocks are available with hardware (screws, Characteristics NFC DIN Wire size mm / AWG CSA 2 conductors for thermocouple (DIA. 0,5 - 1,5 mm) Rated voltage Rated current Rated wire size Wire stripping length Recommended torque V mm / inches Nm / Ib.in used. This requires inventory of many different terminal block types. 31 mm max. / 1.22" 0,4-0,6 Nm / 3.5-5.3 Ib.in Type 1 End section 3 Shield connector NFC-UTE UL connecting CSA bar) NFC-UTE UL CSA NFC-UTE material UL CSA clamps and which match the thermocouple being 500 V Gr.C Accessories 1 UL grey FEM6 CBM5 CBM8 Part number Type th. 2,8 th. 0,5 th. 0,8 Ref. Type Ref. Type Ref. 0118 368.16 0178 745.14 0178 746.15 2 3 Entrelec's MTC 6 terminal block adapts to all thermocouple material. This "neutral" method of connection limits the introduction of foreign materials to an insignificant level. The thermocouple wire insulation is stripped (31 mm maximum) and the bare wires are superimposed on one another. The thermocouple wires are in contact over their complete 31 mm length and tightened at two points by round tip screws (see figure 2). The screws, made of plated brass, have only a mechanical function, that of holding the wires together with a point contact. Thus, the pressure points are not relevant in the connection environment. One thermocouple lead connects through one terminal block (see figure 2). The MTC 6 requires only 6 mm of space, allowing 50 terminals per foot of rail. Thermocouple shield wire connector bar R R See section on markers marking method 350 11 Sides of block 12 Top of block The MTC 6 can be field or factory equipped with a shield connector bar (see figure 1). This bar, made of treated brass, mounts in the lower part of the terminal block. It ensures the continuity of the thermocouple wire shield through the terminal block or to ground with no additional spacing.