Multifunction differential thermostat TR121
TR121 is multifunction differential thermostat with 6 operation functions and 4 service functions. The relay has two normally open output contacts 16 A. Multifunction differential thermostat TR121 is delivered together with two sensors with cable length 3 meters.
- temperature measuring range -40°C ... 95°C
- temperature difference 7°C ... 25°C
- 6 working and 4 service functions
- 16 A output relay contacts
- small dimension 1-DIN rail module
- relay status LED signalization
F1 - differential thermostat
If T is set on - 40°C, it is compared only set difference between measured temperatures t1, t2:
t1 - t2 > D + 1°C ... R1 closed
t1 - t2 < D ... R1 opened
t2 - t1 >D + 1°C ... R2 closed
t2 - t1 < D ... R2 opened
Note: hysteresis is fix 1°C
If T is set on different temperature than - 40°C, it is compared measured t2 with temperature T:
t2 > T + 1°C ... R1 closed
t2 < T ... R1 opened
Note: hysteresis is fix 1°C
F2 - double stage thermostat 1
It is compared only measured temperature t1 with set reference temperature T:
t1 > T ... R1 and R2 closed
T - D < t1 < T ... R1 closed, R2 opened
t1 < T - D ... R1 and R2 opened
Note: sensor 2 is not connected
F3 - double stage thermostat 2
It is compared only measured temperature t1 with set reference temperature T:
t1 > T ... R2 closed
T - D < t1 < T ... R1 closed
t1 < T - D ... R1 and R2 opened
Note: sensor 2 is not connected
F4 - zone thermostat 1 ch.
It is compared only measured temperature t1 with set reference temperature T and difference D:
t1 < T - D ... R1 closed
t1 > T ... R1 opened
Note: sensor 2 is not connected. If there is instead of sensor 2 terminal link, both relays R1, R2 are operating.
F5 - zone thermostat 2 ch.
It is compared measured temperature t1 and t2 with set reference temperature T and difference D. Sensor 1 controls relay R1. Sensor 2 controls relay R2. Function is the same as for function F4:
t1 < T - D ... R1 closed
t1 > T ... R1 opened
t2 < T - D ... R2 closed
t2 > T ... R2 opened
F6 - heating / cooling
It is compared only measured temperature t1 with set reference temperature T and difference D:
t1 > T ... R1 closed (cooling)
t1 < T - 2°C ... R1 opened
t1 < T - D ... R2 closed (heating)
t1 > T - D + 2°C ... R2 opened
T - D < t1 < T ... R1 and R2 opened
Note: Sensor 2 is not connected
Technical features
| Parameter | Value |
|---|---|
| supply voltage range | 89 ... 264 VAC |
| measuring temperature range | -40°C ... 109°C |
| adjustbale temperature difference | 7°C ... 25°C |
| type of sensor | BMR RT_P, NTC 3k3 |
| self consumption | max. 1.5 VA |
| number and type of contacts | 2 x NO |
| nominal current of output contact | 16 A |
| switching power | max. AC 2000 VA |
| trigger current | 30 A |
| nominal / max switching voltage | 250 VAC / 440 VAC |
| mechanical lifetime | 3 x 106 |
| electrical lifetime | 1 x 104 250 VAC, 8A |
| ambient working temperature | -20 .. +55 °C |
| working position | any |
| mounting | IEC 60715 (DIN 35) |
| protection degree | IP 20 |
| electrical strength | 4 kV |
| maximum input wire diameter | max. 2 x 1.5 mm2; 1 x 2.5 mm2 |
| weight | 85 g |
| dimensions | 90 x 18 x 65 mm |
| related norms | IEC 60255-1 |