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- Overview
- Specifications
- Description
- Applications
- Troubleshooting
- FAQ
- Recommended Products
Overview
Place of Origin: |
USA |
Brand Name: |
HONEYWELL |
Model Number: |
T921D-1008 T921D 1008 |
Packaging Details: |
Original new Factory Sealed |
Delivery Time: |
5-7 days |
Payment Terms: |
T/T |
Supply Ability: |
In stock |
Specifications
|
Parameter |
Value |
|
Model |
T921D-1008 T921D 1008 |
|
Product Type |
Thermostat |
|
Dimensions |
8.6 × 8.6 × 2.5 cm |
|
Accuracy |
±0.5°C |
|
Mounting Type |
Panel mounting |
|
Interface Type |
RS485 |
|
Communication Protocol |
Modbus RTU |
|
Protection Rating |
IP65 |
|
Resistance |
135 Ω |
|
Temperature Range |
56°F to 84°F (13°C to 29°C) |
|
Power Supply |
24 VAC |
Description
The Honeywell T921D-1008 T921D 1008 is a thermostat. This thermostat is primarily used for monitoring and regulating indoor temperature. It can detect minute changes in indoor air temperature with extreme sensitivity and, relying on internal resistive elements and a valve motor, automatically adjusts the opening angle of the valves based on the actual temperature.
Applications
Semiconductor Plants: High protection and stable temperature control for cleanroom and microelectronics environments.
Biopharmaceutical Plants: Modbus communication enables real-time temperature monitoring in sterile production areas.
Automotive Manufacturing Plants: Panel-mounted design drives proportional valves and dampers in assembly and paint workshops.
Food Processing Plants: Dust and water resistance ensures stable climate control in humid cleaning environments.
Textile Plants: Precise temperature regulation supports fiber processing and prevents material deformation.
Troubleshooting
RS485 communication failure: Check Modbus RTU Slave ID, baud rate, and parity match master device. If correct, add 120Ω termination resistors at both ends of the 485 bus.
Valve sluggish or stuck: Check 135Ω control circuit for open/high-impedance faults. If wiring is OK, verify internal potentiometer impedance matching with actuator.
Panel unresponsive or drift: Check 24 VAC supply stability. In high humidity near 29°C full load, inspect sealing and possible condensation ingress.
FAQ
Q: What is the measurement accuracy of T921D-1008 T921D 1008?
A: Its measurement accuracy is ±0.5°C.
Q: What mounting method does T921D-1008 T921D 1008 use?
A: It uses panel mounting.
Q: What communication protocol does T921D-1008 T921D 1008 use?
A: It uses the Modbus RTU communication protocol.
Q: What is the enclosure protection rating of T921D-1008 T921D 1008?
A: Its protection rating is IP65.
Q: What is the power supply voltage of T921D-1008 T921D 1008?
A: Its power supply requirement is 24 VAC.
