CROUZET CONTROL
Temperature monitoring relays HT81, HWT81 - OBSOLETE
Control relay for temperature monitoring in lift machinery rooms, used for monitoring of temperatures between +4 °C and +40 °C per the EN 81 standard.
HT81 : As long as the temperature that is controlled by the PT100 sensor is between the two limit values, which are preset at the front, the relay output is activated and the yellow LEDs are on.
When the temperatures is over or under one of these limit values (upper or lower), the time delay (Tt), which is set at the front, begins to count down. The yellow LED for the set limit value (upper or lower) flashes. If the temperature is still too high or low after the time delay, the relay drops out and the yellow LED turns off. As soon as the temperature returns to the set range, the relay activates (allowing for a certain response time). If the PT100 sensor is incorrectly connected (open circuit or short circuit), the relay drops out and the three LEDs flash.
HT81-2: Same function as above except with 2 relay outputs.
HWT81: As long as the temperature that is controlled by the PT100 sensor is between the two limit values, which are preset at the front, the relay output is activated and the yellow LEDs are on. When the temperature passes one of the set limit values (upper or lower), the time delay (Tt) is activated, which is also set at the front. The yellow LED R1 for temperature flashes. Once the delay has passed, the relay drops out and the LED turns off if the temperature still exceeds the set limit values. The relay output R1 activates immediately as soon as the temperature is between the preset limit values.
The relay also monitors the phase sequence L1, L2 and L3 in the 3-phase network as well as total phase interruption, even during regeneration (returned voltage) of the phase (<70 %). After an activation delay and for as long as no phase faults exist, R2 is activated and the LED R2 turns on. When a fault occurs, the relay drops out and the LED R2 turns off. Once the fault is corrected, the relay re-activates and the LED R2 turns on again. If the PT100 sensor is incorrectly connected (open circuit or short circuit), the relay output R1 deactivates and the LED R1 flashes.
- OBSOLETE WITH NO REPLACEMENT
- Temperature monitoring, lift machinery room per EN81
- Adjustable control between +4°C and +40°C
- PT100 input
- Phase monitoring
Selected variant
Technical data
| Approvals | CSA, GL, RoHS, UL |
|---|---|
| Breaking capacity | 5A, 250V AC/DC |
| Function | Under/Overtemperature |
| IP class connection | IP20 |
| IP class housing | IP30 |
| Lower limit | -1 - 11°C |
| Output | Relay 1 pole C/O |
| Sensor cable length max | 10 m |
| Storage temperature max | 70 °C |
| Storage temperature min | -40 °C |
|---|---|
| Supply voltage | 24-240V ac/dc |
| Temperature operational max | 50 °C |
| Temperature operational min | -20 °C |
| Time delay startup | 0,2 s |
| Time delay when exceeding the limit value | 1-10s |
| Upper limit | 34 - 46°C |
| Weight | 121 g |
Downloads
Product description
Control relay for temperature monitoring in lift machinery rooms, used for monitoring of temperatures between +4 °C and +40 °C per the EN 81 standard.
HT81 : As long as the temperature that is controlled by the PT100 sensor is between the two limit values, which are preset at the front, the relay output is activated and the yellow LEDs are on.
When the temperatures is over or under one of these limit values (upper or lower), the time delay (Tt), which is set at the front, begins to count down. The yellow LED for the set limit value (upper or lower) flashes. If the temperature is still too high or low after the time delay, the relay drops out and the yellow LED turns off. As soon as the temperature returns to the set range, the relay activates (allowing for a certain response time). If the PT100 sensor is incorrectly connected (open circuit or short circuit), the relay drops out and the three LEDs flash.
HT81-2: Same function as above except with 2 relay outputs.
HWT81: As long as the temperature that is controlled by the PT100 sensor is between the two limit values, which are preset at the front, the relay output is activated and the yellow LEDs are on. When the temperature passes one of the set limit values (upper or lower), the time delay (Tt) is activated, which is also set at the front. The yellow LED R1 for temperature flashes. Once the delay has passed, the relay drops out and the LED turns off if the temperature still exceeds the set limit values. The relay output R1 activates immediately as soon as the temperature is between the preset limit values.
The relay also monitors the phase sequence L1, L2 and L3 in the 3-phase network as well as total phase interruption, even during regeneration (returned voltage) of the phase (<70 %). After an activation delay and for as long as no phase faults exist, R2 is activated and the LED R2 turns on. When a fault occurs, the relay drops out and the LED R2 turns off. Once the fault is corrected, the relay re-activates and the LED R2 turns on again. If the PT100 sensor is incorrectly connected (open circuit or short circuit), the relay output R1 deactivates and the LED R1 flashes.
Related
OEM introduces IATECH - The Industrial Automation Technology Expo
We are thrilled to announce the launch of IATECH, THe Industrial Automation Technology expo at Leicester Marriott Hotel on 23rd October. The ultimate platform for showcasing our extensive product range and broad business areas, featuring over 50 leading suppliers under one roof!
Automation Components for Specialist Vehicles
The specialist vehicle industry can include automotive and EV, heavy vehicles such as agriculture and rail, and marine. This email takes you through some of the various products we offer for specialist vehicle applications.
Modern Power Distribution
This blog post delves into the key components, current trends, and best practices in power distribution, illustrating the significant impact these systems have on our daily operations and long-term energy strategies.
Lightning and surge protection to safeguard equipment
We shine a spotlight on surge protection devices (SPDs), a crucial yet often overlooked component in industrial settings. Every surge of electricity, every fluctuation in voltage, poses a potential threat to your machinery and systems.
Efficient crimping, punching and stripping
Renowned for high-quality cable cutting and crimping tools, Klauke serves electrical contractors, cable jointers, and linemen across a spectrum of sectors
Case Study - Electro Pneumatic Control Box
At OEM Automatic, we can supply a series of components for your one project. All under one roof. This case study discusses how we supplied several components for our customer's new electro-pneumatic control box.
