ZW-CM

Supported Applications

The Omega ZW-CM series comprises compact, wall-mounted wireless environmental sensors designed to monitor and transmit temperature, relative humidity, and barometric pressure. These fully self-contained units are intended for residential, industrial, or commercial indoor environments.

The system operates as part of the Omega ZW-Series wireless sensor architecture, communicating with a ZW-REC coordinator that connects to an Ethernet network for web-based monitoring. The series supports integration with the Omega Enterprise Gateway (OEG) for email alarming, data historian functions, and OPC/UA or DA support.

Operating Conditions & Performance

The ZW-CM sensors operate within a temperature range of -18 to 55°C (-0.4 to 131°F) at up to 90% RH non-condensing. Measurement capabilities include:

• Temperature: Range of -18 to 55°C (-0.4 to 131°F); Accuracy of ±0.5°C for 10 to 55°C and ±1°C for -18 to 10°C; Resolution of 0.1°C.
• Relative Humidity: Range of 5% to 95%; Accuracy of ±3% (20% to 80%) and ±5% (5% to 95%); Hysteresis of ±1% RH; Resolution of 0.1%.
• Barometric Pressure: Range of 300 to 1100 mbar; Accuracy of ±4 mbar; Repeatability of 0.1 mbar.

The device requires a warm-up period of 30 minutes to achieve rated accuracy. Power is supplied by two AA-cell 1.5 Vdc batteries included with the unit.

Configuration Options

The series offers configurable sensor types and transmission intervals, allowing selection based on specific monitoring needs:

• Sensor Configurations: Available as ZW-CM-TH (Temperature and Humidity) or ZW-CM-BTH (Temperature, Humidity, and Barometric Pressure).
• Housing & Construction: Enclosed in polycarbonate with overall dimensions of 135.9 L x 82 W x 39 mm D (5.35 x 3.23 x 1.56").
• Wireless Communication: Transmits via IEEE 802.15.4, DSSS at 2.4 GHz using standard TCP/IP packets.
• Battery Life & Transmission Rate: Battery life varies by transmission frequency: approximately 1 year with a 1-second interval; 7 years with a 2-minute interval; and up to 15 years with a 5-minute interval. A complete system requires at least one End Device (ZW-CM) and one Coordinator/Receiver (ZW-REC).

For demanding NEMA rated industrial applications, the bundle references the ZW-ED Universal sensor transmitter.

Key Product Differences

The primary distinction within the series is the inclusion of barometric pressure sensing. The ZW-CM-BTH model provides temperature, humidity, and barometric pressure measurements, whereas the ZW-CM-TH model measures only temperature and relative humidity.