Send a part number, a photo, or a whole BOM — we supply it and stand behind it. Worldwide shipping to 80+ countries.

3G Electric
RFQ CartGet a QuoteSign inSign up
Dwyer Humidity Sensor: 4 to 20 mA, Screw Terminals, -4°F to 140°F - Indoor Wall-Mount Transmitters
DwyerIndoor Wall-Mount Transmitters

Dwyer Humidity Sensor: 4 to 20 mA, Screw Terminals, -4°F to 140°F

The Dwyer RHP-2N40 is an indoor wall-mount humidity transmitter with a 4 to 20 mA output. It operates over a temperature range of -4 °F to 140 °F and a relative humidity range of 0% to 100%. This sensor uses screw…

SKU 3G-OTH-179231

Brand
Dwyer
Item
Humidity Sensor: 4 to 20 mA, Screw Terminals, -4°F to 140°F
Category
Indoor Wall-Mount Transmitters
Available to Order
Trade pricing by quote — replies within 24h
Qty
WhatsApp an engineer
No account needed — your quote request goes straight to our engineers. A free account lets you track quotes and re-order faster.
Worldwide Shipping
Air & sea freight
Datasheet on Request
Technical specs
1-Day Quote
Replies within 24h

Technical Specifications

Dwyer
Manufacturer Part Number
RHP-2N40
Type
Screw Terminals, -4°F to 140°F
Output
4 to 20 mA
Temperature Range
-4 °F to 140 °F
Relative Humidity Range
0%to 100%
View Full Spec Sheet

Technical Documents

No technical documents available for this product.
Request documentation →
Not sure this is the right part? Get a recommendation.

Need installation or engineering help?

Installation, commissioning, maintenance plans, system design, and bundled product + service quotes — one team handles the full scope.
Talk to an engineer

Ask a question

Dwyer Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The Dwyer RHP-2N40 is an indoor wall-mount humidity transmitter with a 4 to 20 mA output. It operates over a temperature range of -4 °F to 140 °F and a relative humidity range of 0% to 100%. This sensor uses screw terminals for electrical connections.

Frequently Asked Questions

What is the Dwyer RHP-2N40 humidity sensor used for?

The Dwyer RHP-2N40 is an indoor wall-mount humidity transmitter used for monitoring and controlling relative humidity in HVAC, cleanroom, and building automation systems. It provides a 4 to 20 mA output signal for integration with controllers and PLCs.

What are the specifications of the Dwyer RHP-2N40?

The Dwyer RHP-2N40 has a 4 to 20 mA output, operates over a temperature range of -4 °F to 140 °F, and measures 0% to 100% relative humidity. It features screw terminals for wiring and is designed for indoor wall-mount installation.

Where to buy the Dwyer RHP-2N40 worldwide?

3G Electric supplies the Dwyer RHP-2N40 humidity sensor worldwide. As a global industrial equipment distributor, we handle full logistics, customs clearance, and delivery to your location. Contact us for availability and lead time.

How to install the Dwyer RHP-2N40 humidity sensor?

Mount the Dwyer RHP-2N40 on an indoor wall at a representative location, away from direct heat or drafts. Connect the 4 to 20 mA output to your controller using the screw terminals. Follow Dwyer's manual for wiring and commissioning best practices.

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 indoor wall-mount transmitters. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

You might also need

Burners & Combustion →Pumps & Compressors →Spare Parts →All Products →

Similar products

Matched by specification & description
DWYER Humidity Sensor: 4 to 20 mA, Screw Terminals, -4°F to 140°F, 0%to 100% Relative Humidity Range (MPN RHP-3N40). Key specifications — Output: 4 to 20 mA; Temperature Range: -4 °F to 140 °F.
Dwyer
DWYER Humidity Sensor: 4 to 20 mA, Screw Terminals, -4°F to 140°F, 0%to 100% Relative Humidity Range (MPN RHP-3N40). Key specifications — Output: 4 to 20 mA; Temperature Range: -4 °F to 140 °F.
DWYER Humidity Sensor: 4 to 20 mA, Screw Terminals, -4°F to 140°F, 0%to 100% Relative Humidity Range (MPN RHP-3N40-LCD). Key specifications — Output: 4 to 20 mA; Temperature Range: -4 °F to 140 °F.
Dwyer
DWYER Humidity Sensor: 4 to 20 mA, Screw Terminals, -4°F to 140°F, 0%to 100% Relative Humidity Range (MPN RHP-3N40-LCD). Key specifications — Output: 4 to 20 mA; Temperature Range: -4 °F to 140 °F.
DWYER Humidity Sensor: 4 to 20 mA, Screw Terminals, -4°F to 140°F, 0%to 100% Relative Humidity Range (MPN RHP-2E40-LCD). Key specifications — Output: 4 to 20 mA; Temperature Range: -4 °F to 140 °F.
Dwyer
DWYER Humidity Sensor: 4 to 20 mA, Screw Terminals, -4°F to 140°F, 0%to 100% Relative Humidity Range (MPN RHP-2E40-LCD). Key specifications — Output: 4 to 20 mA; Temperature Range: -4 °F to 140 °F.
DWYER Humidity Sensor: 4 to 20 mA, Screw Terminals, -4°F to 140°F, 0%to 100% Relative Humidity Range (MPN RHP-2N40-LCD). Key specifications — Output: 4 to 20 mA; Temperature Range: -4 °F to 140 °F.
Dwyer
DWYER Humidity Sensor: 4 to 20 mA, Screw Terminals, -4°F to 140°F, 0%to 100% Relative Humidity Range (MPN RHP-2N40-LCD). Key specifications — Output: 4 to 20 mA; Temperature Range: -4 °F to 140 °F.
DWYER Humidity/Temperature Sensor: 4 to 20 mA, Solid State Band Gap, Screw Terminals, -4°F to 140°F (MPN RHP-2N44). Key specifications — Sensing Element Type: Solid State Band Gap; Temperature Accuracy: ±0.9°F @ 77°F; Output: 4 to 20 mA; Temperature Range: -4 °F to 140 °F.
Dwyer
DWYER Humidity/Temperature Sensor: 4 to 20 mA, Solid State Band Gap, Screw Terminals, -4°F to 140°F (MPN RHP-2N44). Key specifications — Sensing Element Type: Solid State Band Gap; Temperature Accuracy: ±0.9°F @ 77°F; Output: 4 to 20 mA; Temperature Range: -4 °F to 140 °F.
DWYER Humidity/Temperature Sensor: 4 to 20 mA, 10K Ohm Type III Thermistor, Screw Terminals, RHP-E/N (MPN RHP-2N4A). Key specifications — Sensing Element Type: 10K Ohm Type III Thermistor; Temperature Accuracy: ±0.36°F @ 77°F; Output: 4 to 20 mA; Temperature Range: -4 °F to 140 °F.
Dwyer
DWYER Humidity/Temperature Sensor: 4 to 20 mA, 10K Ohm Type III Thermistor, Screw Terminals, RHP-E/N (MPN RHP-2N4A). Key specifications — Sensing Element Type: 10K Ohm Type III Thermistor; Temperature Accuracy: ±0.36°F @ 77°F; Output: 4 to 20 mA; Temperature Range: -4 °F to 140 °F.

More from Dwyer

View all Dwyer parts →
DWYER Humidity Sensor: 4 to 20 mA, Screw Terminals, -4°F to 140°F, 0%to 100% Relative Humidity Range (MPN RHP-3E40). Key specifications — Output: 4 to 20 mA; Temperature Range: -4 °F to 140 °F.
Dwyer
DWYER Humidity Sensor: 4 to 20 mA, Screw Terminals, -4°F to 140°F, 0%to 100% Relative Humidity Range (MPN RHP-3E40). Key specifications — Output: 4 to 20 mA; Temperature Range: -4 °F to 140 °F.
DWYER Humidity/Temperature Sensor: 4 to 20 mA, Solid State Band Gap, Screw Terminals, -4°F to 140°F (MPN RHP-2E4B). Key specifications — Sensing Element Type: Solid State Band Gap; Temperature Accuracy: ±0.36°F @ 77°F; Output: 4 to 20 mA; Temperature Range: -4 °F to 140 °F.
Dwyer
DWYER Humidity/Temperature Sensor: 4 to 20 mA, Solid State Band Gap, Screw Terminals, -4°F to 140°F (MPN RHP-2E4B). Key specifications — Sensing Element Type: Solid State Band Gap; Temperature Accuracy: ±0.36°F @ 77°F; Output: 4 to 20 mA; Temperature Range: -4 °F to 140 °F.
DWYER Humidity/Temperature Transmitter: 0 to 10V DC, Screw Terminals, 0% Humidity Measurement - Min (MPN RHPLC-3N22). Key specifications — Temperature Accuracy: ±0.9°F at 77°F; Output: 0 to 10V DC.
Dwyer
DWYER Humidity/Temperature Transmitter: 0 to 10V DC, Screw Terminals, 0% Humidity Measurement - Min (MPN RHPLC-3N22). Key specifications — Temperature Accuracy: ±0.9°F at 77°F; Output: 0 to 10V DC.
DWYER Humidity/Temperature Sensor: 4 to 20 mA, Solid State Band Gap, Screw Terminals, -4°F to 140°F (MPN RHP-3N44-LCD). Key specifications — Sensing Element Type: Solid State Band Gap; Temperature Accuracy: ±0.9°F @ 77°F; Output: 4 to 20 mA; Temperature Range: -4 °F to 140 °F.
Dwyer
DWYER Humidity/Temperature Sensor: 4 to 20 mA, Solid State Band Gap, Screw Terminals, -4°F to 140°F (MPN RHP-3N44-LCD). Key specifications — Sensing Element Type: Solid State Band Gap; Temperature Accuracy: ±0.9°F @ 77°F; Output: 4 to 20 mA; Temperature Range: -4 °F to 140 °F.
DWYER Humidity/Temperature Transmitter: 4 to 20 mA, Screw Terminals, 100% Humidity Measurement - Max (MPN RHPLC-3N11). Key specifications — Temperature Accuracy: ±0.9°F at 77°F; Output: 4 to 20 mA.
Dwyer
DWYER Humidity/Temperature Transmitter: 4 to 20 mA, Screw Terminals, 100% Humidity Measurement - Max (MPN RHPLC-3N11). Key specifications — Temperature Accuracy: ±0.9°F at 77°F; Output: 4 to 20 mA.
DWYER Humidity/Temperature Sensor: 4 to 20 mA, Solid State Band Gap, Screw Terminals, -4°F to 140°F (MPN RHP-2E4A). Key specifications — Sensing Element Type: Solid State Band Gap; Temperature Accuracy: ±0.36°F @ 77°F; Output: 4 to 20 mA; Temperature Range: -4 °F to 140 °F.
Dwyer
DWYER Humidity/Temperature Sensor: 4 to 20 mA, Solid State Band Gap, Screw Terminals, -4°F to 140°F (MPN RHP-2E4A). Key specifications — Sensing Element Type: Solid State Band Gap; Temperature Accuracy: ±0.36°F @ 77°F; Output: 4 to 20 mA; Temperature Range: -4 °F to 140 °F.
DWYER Humidity Sensor: 4 to 20 mA, Screw Terminals, -4°F to 140°F, 0%to 100% Relative Humidity Range (MPN RHP-2E40). Key specifications — Output: 4 to 20 mA; Temperature Range: -4 °F to 140 °F.
Dwyer
DWYER Humidity Sensor: 4 to 20 mA, Screw Terminals, -4°F to 140°F, 0%to 100% Relative Humidity Range (MPN RHP-2E40). Key specifications — Output: 4 to 20 mA; Temperature Range: -4 °F to 140 °F.
DWYER Humidity/Temperature Sensor: 4 to 20 mA, 10K Ohm Type II Thermistor, Screw Terminals, RHP-E/N (MPN RHP-2N4B). Key specifications — Sensing Element Type: 10K Ohm Type II Thermistor; Temperature Accuracy: ±0.36°F @ 77°F; Output: 4 to 20 mA; Temperature Range: -4 °F to 140 °F.
Dwyer
DWYER Humidity/Temperature Sensor: 4 to 20 mA, 10K Ohm Type II Thermistor, Screw Terminals, RHP-E/N (MPN RHP-2N4B). Key specifications — Sensing Element Type: 10K Ohm Type II Thermistor; Temperature Accuracy: ±0.36°F @ 77°F; Output: 4 to 20 mA; Temperature Range: -4 °F to 140 °F.