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Dwyer Humidity Transmitter: 1/2 in NPT, 4 to 20 mA, 0%to 100% Relative Humidity Range - Hazardous Location Transmitters
DwyerHazardous Location Transmitters

Dwyer Humidity Transmitter: 1/2 in NPT, 4 to 20 mA, 0%to 100% Relative Humidity Range

The Dwyer HHT-IU is a hazardous location humidity transmitter with a 1/2 in NPT connection, offering a 4 to 20 mA output and a 0% to 100% relative humidity range. It operates on a 9.5 to 28V DC power supply and is FM…

SKU 3G-OTH-187112

Brand
Dwyer
Item
Humidity Transmitter: 1/2 in NPT, 4 to 20 mA, 0%to 100% Relative Humidity Range
Category
Hazardous Location Transmitters
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Technical Specifications

Dwyer
Manufacturer Part Number
HHT-IU
Type
4 to 20 mA, Female
Relative Humidity Range
0%to 100%
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Dwyer Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The Dwyer HHT-IU is a hazardous location humidity transmitter with a 1/2 in NPT connection, offering a 4 to 20 mA output and a 0% to 100% relative humidity range. It operates on a 9.5 to 28V DC power supply and is FM approved.

Frequently Asked Questions

What is the Dwyer HHT-IU humidity transmitter used for?

The Dwyer HHT-IU is a hazardous location humidity transmitter used in industrial environments requiring FM approval. It measures 0% to 100% relative humidity and outputs a 4 to 20 mA signal, suitable for process control in chemical plants, refineries, and other explosive atmospheres.

What are the specifications of the Dwyer HHT-IU?

The Dwyer HHT-IU has a 1/2 in NPT connection, 4 to 20 mA output, 0% to 100% relative humidity range, and operates on 9.5 to 28V DC power. It is FM approved and features a female connection. The manufacturer part number is HHT-IU.

Where to buy the Dwyer HHT-IU worldwide?

3G Electric supplies the Dwyer HHT-IU humidity transmitter worldwide. As a global industrial solutions provider, we handle full logistics, customs clearance, and delivery to your site. Contact us for availability and lead time on this FM-approved hazardous location transmitter.

How to install the Dwyer HHT-IU humidity transmitter?

Install the Dwyer HHT-IU in a hazardous location per FM guidelines. Use the 1/2 in NPT female connection for mounting. Wire the 4 to 20 mA loop to a 9.5 to 28V DC supply. Ensure the sensor is exposed to the process air and avoid condensation on the sensing element.

Used in

Common applications for Dwyer
Combustion air-filter monitoring — Magnehelic Series 2000 on burner air-intake filter banks
Clean-room and pharmaceutical pressurisation — Magnehelic / Capsuhelic differential-pressure gauges
HVAC fan-discharge static pressure — Mark II inclined-vertical manometers on AHU test points
Filter-blockage alarms — Photohelic Series 3000 combined gauge/switch on air-handling units
BMS-integrated pressure monitoring — Digihelic DH3 with 4–20 mA output for building management

Dwyer Products

3G Electric supplies Dwyer hazardous location transmitters. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

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DWYER Humidity Transmitter: 1/2 in NPT, 4 to 20 mA, 0%to 100% Relative Humidity Range, Female (MPN HHT-EU). Key specifications — attr1118745: DWYER; attr1118752: CE; attr1118763: 16.5 to 28V DC.
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DWYER Humidity Transmitter: 1/2 in NPT, 4 to 20 mA, 0%to 100% Relative Humidity Range, Female (MPN HHT-EU). Key specifications — attr1118745: DWYER; attr1118752: CE; attr1118763: 16.5 to 28V DC.
DWYER Temperature/Humidity Transmitter: 1/2 in NPT, -40 to 140 Degrees F, 4 to 20 mA, Female (MPN HHT-IT). Key specifications — attr1118745: DWYER; attr1118752: Intrinsically Safe; attr1118770: Solid State Band Gap; attr1118777: ±0.9°F @ 77°F; attr1118763: 9.5 to 28V DC; attr1118746: -40 °F to 140 °F.
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DWYER Temperature/Humidity Transmitter: 1/2 in NPT, -40 to 140 Degrees F, 4 to 20 mA, Female (MPN HHT-IT). Key specifications — attr1118745: DWYER; attr1118752: Intrinsically Safe; attr1118770: Solid State Band Gap; attr1118777: ±0.9°F @ 77°F; attr1118763: 9.5 to 28V DC; attr1118746: -40 °F to 140 °F.