HX94-Srs-Temp-RH-Sig-Cond

Supported Applications

The Omega HX94 series is a stainless steel relative humidity and temperature probe transmitter designed for duct mount monitoring applications. The unit provides reliable, low-cost measurement of air conditions using solid-state sensors that offer excellent sensitivity, fast response, and stability. It delivers linearized outputs suitable for interfacing with most display and control devices.

Documented media compatibility includes air and non-corrosive gases. The probe is not intended for use in medical applications or on humans.

Operating Conditions & Performance

The HX94 series operates within a process temperature range of -20 to 85°C (4 to 185°F). Relative humidity measurement spans 3 to 95% RH, with an accuracy of ±2% RH and repeatability of ±1% RH. Temperature is measured from 0 to 100°C (32 to 212°F) using a Thin-Film 100 Ω Platinum RTD (DIN 43760), providing an accuracy of ±0.6°C (±1°F) and repeatability of ±0.3°C (±0.5°F).

Response times vary by condition: less than 2 seconds in moving air at 1 m/sec, and less than 10 seconds in still air for temperature response (60% response). For relative humidity, the time constant is less than 20 seconds for a 10 to 90% RH change and less than 30 seconds for a 90 to 10% RH change. The unit requires a power supply of 6 to 30 Vdc with polarity protection.

Configuration Options

The series supports multiple output configurations, housing styles, and connection types:

• Output Signals: Available as HX94C for 4 to 20 mA current output or HX94V for 0 to 1 Vdc voltage output.
• Housing & Enclosure: Features a stainless steel NEMA 4 enclosure with a removable protective sensor filter cap. The probe dimensions are 254 x 19 mm (10 x 0.75") diameter, including a 305 mm (12") cable.
• Process Connections: Configurable for duct mounting via a removable, variable depth flange (adjustable from 25.4 to 227 mm or 1 to 9 inches) requiring a 21 mm (0.812") hole; wall mounting is supported with an included bracket.
• Electrical Connections: Options include a standard 4-pin mating connector accepting 26 to 18 AWG wires, or integrated lead wire versions: HX94CW/VW models feature a 1 m (3') braided and shielded cable with PVC sheathing; HX94CNPT/VNPT models provide a ½" male NPT fitting with a 1 m (3') braided/shielded cable.
• Power & Load: For current output, maximum loop impedance is calculated as Rmax = (power supply voltage - 6 volts) / 0.02 amps. For the 1 to 5 Volt Output version, load resistance should be 250 Ohm.

Key Product Differences

The HX94 series is differentiated by output type and connection method:

• HX94C / HX94V: Standard models with 4 to 20 mA or 0 to 1 Vdc outputs, respectively, utilizing a 4-pin mating connector.
• HX94CW / HX94VW: Models equipped with integrated 1 m (3') lead wires instead of the detachable connector.
• HX94CNPT / HX94VNPT: Variants featuring a ½" male NPT fitting and integrated leads for conduit connection.

The series is RoHS 2 Compliant. Weight with the duct flange is approximately 198 g (7 oz).