GW WE600 Capacitive Humidity Sensor and WE700 Precision RTD Temperature Sensor

Overview

The GW WE600 and WE700 are industrial-grade environmental sensing modules engineered for long-term stability and high reproducibility in unattended outdoor and harsh indoor monitoring applications. The WE600 employs a polymer-based capacitive humidity sensing element calibrated across the full 0–100% relative humidity (RH) range, while the WE700 integrates a Class A platinum resistance temperature detector (RTD) per IEC 60751, delivering traceable thermal measurement with ±0.1 °C accuracy from −50 to +50 °C. Both sensors utilize standardized 4–20 mA current-loop output, enabling direct integration into SCADA systems, PLCs, data loggers, and telemetry platforms without signal conditioning. Their fully potted electronics, marine-grade cable assembly, and IP67-rated housings ensure reliable operation in high-humidity, salt-laden, or thermally fluctuating environments—making them suitable for ecological field stations, HVAC commissioning, cold-chain validation, and ambient air quality networks.

Key Features

• Capacitive humidity sensing with factory-calibrated response curve and hysteresis compensation
• Precision Pt100 RTD sensor compliant with IEC 60751 Class A tolerances
• Two-wire 4–20 mA analog output with loop-powered architecture (10–36 VDC supply)
• Robust stainless-steel and anodized aluminum construction with hermetically sealed electronics
• Marine-grade, tinned-copper, shielded cable (standard length: 5 m; custom lengths available)
• Low power consumption and rapid thermal stabilization (≤5 s warm-up time)
• Optional WE770 passive solar radiation shield for meteorological-grade air temperature measurement

Sample Compatibility & Compliance

The WE600 and WE770 are designed for continuous measurement of ambient air conditions in open or semi-enclosed environments. They are not intended for immersion, corrosive gas exposure, or condensing vapor conditions without appropriate protective housing. The sensors comply with RoHS 2011/65/EU and meet EMC immunity requirements per IEC 61326-1 (industrial environment). When deployed with the WE770 sun shield, the WE700 satisfies WMO Guide to Meteorological Instruments and Methods of Observation (CIMO Guide, Chapter 4) specifications for unshielded air temperature error under solar loading. No calibration certificate is supplied standard; NIST-traceable calibration reports are available upon request for GxP-aligned deployments requiring audit-ready documentation.

Software & Data Management

As analog-output devices, the WE600 and WE700 interface natively with any system supporting 4–20 mA input channels—including Campbell Scientific CR series loggers, Siemens Desigo CC, Honeywell Experion PKS, and third-party IoT gateways. GW provides no proprietary software; however, configuration guidelines and scaling equations (e.g., RH = [(I − 4)/16] × 100, T(°C) = [(I − 4)/16] × 100 − 50) are included in the user manual. For regulatory environments governed by FDA 21 CFR Part 11 or ISO/IEC 17025, users must implement external validation protocols—including periodic field verification using reference hygrometers (e.g., Rotronic HC2-S) and dry-well calibrators (e.g., Fluke 9143)—to maintain measurement traceability and data integrity.

Applications

• Long-term ecological monitoring networks (LTER, NEON, Fluxnet)
• Ambient air quality stations requiring concurrent RH and dry-bulb temperature inputs
• Greenhouse and controlled-environment agriculture climate control feedback loops
• Building envelope performance assessment and HVAC commissioning
• Cold storage facility temperature/humidity mapping per ISO 14644-3 and USP
• Marine platform environmental telemetry (offshore weather buoys, port infrastructure)

FAQ

Can the WE600 and WE700 be installed indoors without the WE770 sun shield?

Yes—the WE770 is optional and recommended only for outdoor air temperature measurement where solar radiation error must be minimized. Indoor installations do not require it.
Is the 4–20 mA output linear across the full range?

Yes—both sensors provide linear current output referenced to their respective full-scale ranges (0–100% RH and −50 to +50 °C), with scaling defined per standard industrial practice.
What is the expected service life under continuous outdoor exposure?

With proper mounting and routine visual inspection, typical field longevity exceeds 5 years. Capacitive humidity elements may require recalibration every 24 months in high-condensation environments.
Do these sensors support HART communication?

No—they are pure analog 4–20 mA devices without digital overlay or smart diagnostics. HART-enabled variants are not available in this series.
Are explosion-proof or intrinsically safe versions offered?

No—GW does not currently certify the WE600/WE700 for hazardous area use (ATEX, IECEx, UL Class I Div 1). For such applications, consult GW’s certified partner network for engineered enclosure solutions.