Attributes

Brand	-
Category	Machinery & Equipment / Thermo-hygrometers
Origin	-
Model Number	CWS21
Communication Protocol	RS485 (Modbus RTU)
Mounting Type	DIN Rail (35mm)
Sensor Type	Split Insertion Probe
Temperature Range	-40°C to +80°C
Humidity Range	0% to 100% RH
Accuracy (Temperature)	±0.5°C @ 25°C
Accuracy (Humidity)	±3% RH @ 25°C
Power Supply	DC 12V - 24V
Probe Cable Length	2 Meters (Standard)

6 reviews

Anonymous

Mar 28, 2026

Rating: 5/5

Seamless integration

Integrated perfectly with our existing BMS system. The response time is quick and the humidity readings stabilize rapidly after installation. Very satisfied with this purchase.

Anonymous

Mar 26, 2026

Rating: 4/5

Good product, fast shipping

Works as described. The terminal blocks are easy to wire. I deducted one star simply because the LED indicator is quite bright at night, but that's a very minor complaint.

Anonymous

Mar 15, 2026

Rating: 5/5

Perfect for industrial control panels

The DIN rail mount is very secure and the split design allows me to place the sensor inside the duct while keeping the electronics in the cabinet. RS485 communication was easy to set up with our PLC.

Anonymous

Mar 15, 2026

Rating: 5/5

Great accuracy for the price

Compared this against a calibrated reference meter and the deviation was negligible. The split insertion type is exactly what we needed for retrofitting old systems without replacing entire units.

Anonymous

Mar 09, 2026

Rating: 4/5

Reliable data, clear documentation

We deployed ten of these units in our warehouse. The readings are consistent across all devices. The only minor issue was that the cable could be a bit longer for some specific installations, but overall great value.

Anonymous

Mar 05, 2026

Rating: 5/5

Excellent build quality

Solid construction and the housing feels durable. Setup via Modbus was straightforward using the provided register map. Highly recommended for HVAC monitoring applications.

5 FAQ

Q: What is the operating temperature range for the main electronics module?

A: While the probe can handle -40°C to +80°C, the main DIN rail module is rated for -20°C to +60°C to ensure component longevity.

Q: Do you provide a configuration software tool?

A: No proprietary software is required. You can configure address and baud rate using any standard Modbus master tool or via hardware DIP switches if applicable to your specific batch.

Q: Can the probe cable be extended beyond 2 meters?

A: Yes, the probe cable can typically be extended up to 10 meters using shielded cable, though we recommend consulting the manual for signal integrity best practices.

Q: Does this sensor support Modbus TCP or only RTU?

A: This model (CWS21) supports Modbus RTU over RS485 only. It does not have built-in Ethernet for Modbus TCP.

Q: Is calibration certificate included with the unit?

A: Standard units come with a factory test report. An accredited ISO calibration certificate is available as an optional add-on during checkout.

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