Four wire | Temp Transmitters

Transmitter, IT56 converts the temperature and DC variable input signals into a load independent Direct Current / Voltage signal. The input signal is conditioned and linearised in a range card which is available either as fixed module or exchangeable module. The range card has provision for zero and span fine adjustment. Optional exchangeable range card permits range change even at site. The output from lineariser is given to an Amplifier Card which outputs the load independent current/voltage.

When input/output isolation is required, an isolation card is incorporated. Reference Junction compensation is built-in for T/Cs.

IT56 has modular construction with Mother Board which feeds the power supply to various cards and also interconnects the various modules like amplifier card, range card, isolation card, switching unit, ACJC module etc. Models operating on 24V DC mains are provided with inverter and DC isolator. Refer Ordering Information for options & facilities offered

Features
Specification
Application
Brochure/Documents

1. Permits direct connection to T/Cs, RTDs, Resistance Teletransmitters etc.

2. Output signal (0/4..20 mA, 0..10 V Dc) linear to mV/°C (for T/Cs), Ohm/°C (for RTDS).

3. Isolation between input and output optional.

4. Mains & input/output isolation even with 24V DC mains supply.

5. Permits small spans and input variables down to 1 mV, 5 microAmp, 3.2 ohms (Pt 100 DIN) and 10 ohm ( Resistance Teletransmitters).

6. Very high input impedance of the order of 1 Meg ohm/mV renders lead balancing nnecessary for T/Cs.

7. Field mounting casing with IP54 protection or 19" rack mounting plug-in card.

8. Alarm signaling available optionally.

9. Sensor fail response/ signalling even for 3rd wire break in 3 wire RTD.

Input	Min	Max	Max. permissible source or lead resistance	Input resistance
mV Sensors & Thermocouples with or without zero shift	1 mV	135 mV	1 K ohm/mV	> 1 M ohm/mV
mV or temperature difference with two Thermocouples	1 mV	135 mV	1 K ohm/mV	> 1 M ohm/mV
Voltage upto 150V with or without zero shift	0.15V	150V	5 ohms/volt	> 4 k ohms/V
RTD-Pt 100 DIN 2 wire	3 ohms	250 ohms	10ohms with lead balancing	-
RTD-Pt 100 DIN 3 wire	10 ohms	250 ohms	Up to 10 ohms (Equal lead resis.)	-
Temp. difference with two RTDs	3 ohms	250 ohms	10 ohms with lead balancing	-
Current with or without zero shift	5 µA	100 mA	> 100x input resistance	5.6-1087 ohms, range dependent
Current in sum or diff. mode with without zero shift	200 µA	-	-	350 mV/l1,2
Resistance Teletransmitter	10 ohms	1200ohms	10 ohms	-