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Temperature/Relative Humidity Conditioner/Transmitter Probe

Relative Humidity/Temperature Transmitter, Duct Style


Item# HX94C

In stock

Lead Time (If not in stock): 2 weeks
Relative Humidity/Temperature Transmitter, Duct Style HX94C HX94C
  • ±2% RH Accuracy ±0.6C Temperature Accuracy
  • Stainless Steel NEMA 4 Housing
  • Duct or Wall Mountable Mounting Hardware Included
  • 4-20mA or 0-1Vdc Output Options

HX94C Model Options

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Output Type
Additional Feature
Input Type
Input Ranges
Supply Voltage Type

The HX94 relative humidity/ temperature transmitter provides a reliable and low cost method for duct mount monitoring applications. Solid state sensors provide excellent sensitivity, fast response, and stability. Simple hookup and linearized output permit interfacing with most display and control devices. The NEMA 4 stainless steel enclosure and cable entry connection provides weather tight protection. The digital temperature and relative humidity sensor is protected by a stainless steel cap that is easily removed for cleaning.


Thin-Film Polymer Capacitor
Input Voltage Range:
6 to 30 Vdc, (polarity protected)
3 to 95% RH/±2% RH/±1% RH
Voltage Output:
HX94V: 0 to 1.0 V (0 to 100% RH)
Time Constant: (for 90% response at
25°C; in moving air, 1m/sec.)
Less than 20 seconds, 10 to 90% RH
Less than 30 seconds, 90 to 10% RH

Thin-Film 100 Ω Platinum RTD
(DIN 43760)
Input Voltage Range:
6 to 30 Vdc, (polarity protected)
Range: 0 to 100°C (32 to 212°F)
Accuracy: ±0.6°C

Housing: Stainless steel NEMA 4
Probe: 254 x 19 mm (10 x 0.75") dia.,
305 mm (12") cable
Duct Flange: Removable, variable
25.4 to 227 mm (1 to 9") depth; 70 mm
(2.75") dia., duct hole 21 mm (0.812") dia.
4 mtg holes. 4 mm (0.156") dia. (for #6
sheet metal screws) on 51 mm (2.00") dia.
circle; wall mounting bracket included

HX94C/94V: 4 pin mating connector
accepts 26 to 18 AWG wires
HX94CW/94VW: 1 m (3') braided
and shielded cable, PVC sheathing
HX94CNPT/94VNPT: 1⁄2" male NPT
conductor with 1 m (3') braided/
shielded cable
Weight: 198 g (7 oz) with duct flange

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What is the maximum pressure at which this item can operate?

Asked by: engtech3
Thank you for your inquiry engtech3. Unfortunately, the HX94C is not pressure rated.
Answered by: Application Engineer SP
Date published: 2022-08-19

What type of mating connector is used - I need to order another one.

Asked by: WhyIsThisNecessary
Thanks for your question. The mating connector is listed on the Data sheet (PDF). The model number is HX94-MC. If you add to the cart it will come up to place your order. We do have stock available.
Answered by: Jane
Date published: 2019-05-03

How is the accuracy if the probe has condensation on it? Is there an IP rating for the probe?

Asked by: Eddie J
Hi Eddie Thank you for the inquiry. This probe is not designed to handle condensing humidity conditions. If the sensor gets water droplets on the element it will go into saturation with max output. It would have to dry clean without corrosion to come back on line in calibration. The housing is rated NEMA 4. Best regards OMEGA
Answered by: NorwalkAE_RS
Date published: 2023-02-15

What are the accessories that are required for this one? To what instrument is the 4 pin connector connected?

Asked by: dan123_dan
Thank you for your inquiry. The primary accessories required are a power supply (shown under accessories) on product page, and 4 conductor cable to mate with supplied connector that would be then connected to an instrument to read the values. There are two 4-20 mA outputs (one for temperature, one for relative humidity) that can be connected to any instrument (panel meter, chart recorder, controller, etc.) that accepts a 4-20 mA signal and can be scaled to represent temperature or relative humidity.
Answered by: Application Engineer JB
Date published: 2023-03-28
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