Dwyer Spare Parts & Components: Complete Buyer's Guide

Who Is Dwyer Instruments?

Dwyer Instruments is a well-established OEM specialising in precision measurement and control devices for HVAC, building automation, industrial process, and environmental monitoring applications. Their product portfolio spans pressure measurement, flow sensing, temperature detection, gas detection, and related accessories. The 3G Electric catalog lists 380 Dwyer lines, covering 379 measurement products and 1 valve/solenoid product, making Dwyer one of the most comprehensive measurement brands available through the distributor.

Dwyer Product Lines at a Glance

Understanding the major Dwyer product families helps engineers and procurement teams navigate part selection efficiently. The key categories available through 3G Electric include:

• Differential pressure gauges — including the iconic Magnehelic series
• Pressure switches and transmitters — for process monitoring and control
• CO₂ detectors — with Modbus RTU and BACnet MS/TP communication
• Temperature probes and sensors — thermistors, RTDs, surface and duct-mount types
• Air speed probes — for duct velocity measurement
• Static pressure tap fittings — stainless steel and standard versions
• Current detectors — solid-core and split-core housing options
• Radiant protection shields — for outdoor temperature sensor installations

Key Dwyer Products: Specs Comparison

The table below covers a representative cross-section of Dwyer components available to order. Use it to shortlist candidates before requesting a formal quotation.

How to Identify the Right Dwyer Part Number

Dwyer model numbers encode key configuration details. Follow this process to confirm the correct part before ordering:

1. Locate the nameplate or label on the existing device. The full model number (e.g., DXW-11-153-1 or CDTA-5E000-LCD) is stamped or printed there.
2. Note the measurement range. For pressure devices, confirm the range in bar or Pa (e.g., 0.17 to 0.69 bar for DXW-11-153-1). For CO₂ sensors, confirm ppm range (e.g., 0–2000 ppm for CDTA-5E000-LCD).
3. Check the process connection size and type. Common Dwyer connections include 1/4" NPT female, 1/8 NPT, and 3/16" ID tubing. Mismatched fittings are a leading cause of incorrect orders.
4. Confirm the output signal or communication protocol. Dwyer transmitters may output 4–20 mA or 0–10 V (e.g., AVUB-3-V outputs 0–10 V). CO₂ detectors use RS-485 Modbus RTU or BACnet MS/TP — verify which protocol your BMS requires.
5. Verify the power supply voltage. Many Dwyer sensors accept wide-range supplies (e.g., 10 to 42 VDC / 10 to 30 VAC for CO₂ detectors). Confirm your panel supply before ordering.
6. Match the enclosure/IP rating to the installation environment. Outdoor or wash-down locations require at minimum IP65; the AVUB-3-V air speed probe carries IP67, while the O-4F sealed sensor is rated IP66.
7. Cross-reference the 3G Electric SKU (e.g., DWY24002) when submitting your RFQ to avoid ambiguity.

Compatibility Basics for Dwyer Components

Several compatibility factors apply across Dwyer product lines:

• Sensor element type: Dwyer temperature probes use different sensing elements — 10K Ω Type II Thermistor (TE-END-B), 20 kΩ NTC Thermistor (S2-1F), RTD Pt100 Ω (O-4F), and thermistor/RTD average types (TE-AAG-D0634-00). The replacement must match the controller's input type exactly.
• Probe dimensions: Physical dimensions matter for drop-in replacement. The S2-1F has a 25 mm probe length and 6.3 mm diameter; the O-4F has an 88.9 mm probe length and 5.97 mm diameter. Check the installation pocket or duct penetration before ordering.
• Static pressure tap lengths: The A-301SS is available in 101 mm, 152 mm, and 203 mm lengths. Specify the correct length to suit duct wall thickness.
• Loop resistance for transmitters: The 645-0 transmitter supports 0 to 1000 Ω loop resistance. Confirm your wiring run is within this limit.
• Response time requirements: The 645-0 pressure transmitter responds in 30 to 50 ms. CO₂ detectors (CDTA series) reach 99% of final value within 2 min. Match these to your control system's scan rate.

How to Source Genuine Dwyer Parts Through 3G Electric

3G Electric is an authorised industrial distributor supplying Dwyer components to plant engineers and procurement teams worldwide. The sourcing process is straightforward:

1. Identify the full Dwyer model number and 3G Electric SKU using the steps above.
2. Submit a Request for Quotation (RFQ) via the 3G Electric website product page or contact the sales team directly.
3. Receive a formal quotation including unit price, lead time, and shipping terms. Lead times are confirmed at quotation stage and vary by product line.
4. Place the purchase order referencing both the Dwyer model number and the 3G Electric SKU to ensure exact fulfilment.
5. 3G Electric manages international logistics, customs documentation, and delivery to your facility worldwide.

Frequently Asked Questions

What types of Dwyer products does 3G Electric supply?

3G Electric lists 380 Dwyer catalog lines, covering 379 measurement products — including pressure switches, differential gauges, CO₂ detectors, temperature probes, air speed sensors, current detectors, and static pressure fittings — plus 1 valve/solenoid product. All are available to order with lead times confirmed at quotation.

How do I find the correct Dwyer part number for a replacement?

Locate the model number on the device nameplate (e.g., DXW-11-153-1 or CDTA-5E000-LCD). Then confirm the measurement range, process connection size, output signal or protocol, power supply voltage, and IP rating. Cross-reference the 3G Electric SKU when submitting your RFQ to avoid fulfilment errors.

Are Dwyer CO₂ detectors compatible with BACnet building management systems?

Yes. The CDTA-2N000, CDTA-5N000, and CDTA-5E000-LCD all support RS-485 Modbus RTU or BACnet MS/TP communication. They accept 10 to 42 VDC or 10 to 30 VAC power. Confirm which protocol your BMS requires before ordering, as the model suffix encodes configuration options.

What is the difference between the A-301C and A-301SS static pressure tap connectors?

Both use a 1/4" tap and 3/16" ID tubing connection. The A-301C uses a 304 SS probe and 430 SS flange. The A-301SS is fully stainless (303/304/430 SS) and is available in 101 mm, 152 mm, and 203 mm lengths — specify the length to match your duct wall thickness.

Which Dwyer temperature sensor should I use for outdoor or wet environments?

The O-4F sealed RTD Pt100 Ω sensor carries an IP66 rating and suits outdoor or high-humidity installations. The AVUB-3-V air speed probe is rated IP67. For standard indoor wall mounting, the TE-END-B (ABS housing, -40 to 60 °C) is appropriate. Always match the IP rating to your installation environment.

What output signal does the Dwyer AVUB-3-V air speed probe provide?

The AVUB-3-V outputs 0–10 V over a measurement range of 0 to 16 m/s, with 8% accuracy. It uses a screw connector with a 4–8 mm cable gland and carries an IP67 enclosure rating. It is suitable for air and compatible non-combustible gases only.

Can 3G Electric ship Dwyer parts internationally?

Yes. 3G Electric supplies Dwyer components to plant engineers and procurement teams worldwide, handling international logistics and customs documentation. Delivery terms and lead times are confirmed at the quotation stage — contact the sales team with your Dwyer model number and 3G Electric SKU to receive a formal offer.

How accurate is the Dwyer Magnehelic 2000-500PA differential pressure gauge?

The 2000-500PA is a mechanical differential pressure gauge with a 500 Pa range and a 101.6 mm dial diameter. It connects via 1/8 NPT and operates between -6.67 and 60 °C. For specific accuracy figures, consult the Dwyer datasheet for the 2000 series, as accuracy is not encoded in the catalog SKU alone.