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Series-DM
Differential Pressure Transmitter for Air/Gases, 4-20 mA Output
Models In Stock
- Reduced installation time through zero and span controls that provides quick and easy calibration
- Fast and easy setup and calibration with push-button zero and span controls
- Immediate corrective action can be taken by local alerts via the easy-to-read LCD display
- Reduces upgrade installation costs and simplifies field upgrade from a Magnehelic® gage, as both use the same diameter cutout
Series-DM
From
C$
258.42
Models In Stock
Product Overview
- Accuracy Detail ± 1% FSO for all ranges except 0.25 in w.c. @ ± 2% FSO, and ranges at or below ± 0.1 in w.c. @ ± 4% FSO
- Applications Filter Monitoring, HVAC
- Burst Pressure 6 psi Maximum
- Dial Depth 48 mm
- Dial Outer Diameter 127 mm
- Display Type LCD
- Electrical Connection Screw Terminal
- Enclosure Ratings IP66, NEMA Type 4X
- Long Term Stability < ± 1%FSO/year
- Materials Polycarbonate
- Media Compatibility Clean dry air / inert gas, HVAC / room air, Inert / non-reactive gases, Helium, Nitrogen, Non-Conductive Gases, Non-Corrosive Dry Gases
- Mounting Note Not Position Sensitive
- Number of Wires 2
- Operating Temperature, Max 70 °C
- Operating Temperature, Min -20 °C
- Measurement Pressure Type Differential
- Process Connection Size 1/8 in, 3/16 in, 1/4 in
- Process Connection Type Stepped Barb Fitting
- Series ID Series-DM
- Span Adjustment Push Button
- Thermal Effects 0.036% FS/°C
- Weight 200 g
- Zero Setting Adjustable Range Push button
Supported Applications
The Dwyer Series DM DigiMag® Differential Pressure Transmitter is designed to sense the pressure of air and non-combustible, compatible gases. The transmitter provides a standard 4-20 mA output signal for integration into control systems monitoring differential pressure conditions.
Operating Conditions & Performance
The Series DM operates within an ambient temperature range of -4 to 158°F (-20 to 70°C). Accuracy is specified as ±1% FSO for most ranges, with specific exceptions: the 0.25 in w.c. range offers ±2% FSO accuracy, and ranges at or below ±0.1 in w.c. offer ±4% FSO accuracy. Stability is rated at < ±1%/year FSO.
Pressure limits vary by measurement range:
- Ranges > 1 in w.c.: 6 psi max operation, 6 psi burst
- Ranges ≤ 1 in w.c.: 3.6 psi max operation, 6 psi burst
The unit features a thermal effect of 0.036% FS/°C (0.02% FS/°F). Response time is configurable via buttons for Fast (0 seconds) or dampened (4 seconds) response.
Configuration Options
The series offers a wide range of factory-calibrated models covering differential pressure ranges from 0.1 in w.c. to ±1250 Pa, including specific options for mm w.c. and negative-to-positive spans such as -0.05-0.20 in w.c.
Key configurable features include:
- Housing & Mounting: Polycarbonate molded housing with integral pressure connections, designed to mount in the same 5" OD (127 mm) cutout as a standard Magnehelic® gage. The unit is not sensitive to mounting orientation.
- Process Connections: Male ports on the side accommodate flexible tubing sizes of 1/8", 3/16", 1/4", 5 mm, and 6 mm ID.
- Electrical Interface: Screw-type terminals for a 2-wire system powered by 10-35 VDC. Maximum loop resistance is 0 to 1250 Ω max., with current consumption up to 21 mA max.
- Calibration & Display: Digital push-button zero and span adjustments replace turn-potentiometers. A single push-button allows field selection of 4 to 6 engineering units depending on the range.
The enclosure is rated NEMA 4X (IP66). Wetted materials should be confirmed by consulting the factory.
Key Product Differences
Different models within the Series DM are distinguished primarily by their calibrated pressure ranges. Model numbers follow a specific code structure where suffixes indicate options:
- -FC: Factory calibration certificate
- -LG: Light grey overlay
- -NIST: NIST traceable calibration certificate
- -SS: 304 brushed SS bezel
The series includes models for positive-only ranges (e.g., DM-001 at 0.1 in w.c.) and bidirectional ranges (e.g., DM-202 at ±0.25 in w.c.). The unit carries CE approval.
PDFs & Manuals
Accessories
accessories
303 SS Static pressure tip with mounting flange, for 3/16" I.D. rubber or plastic tubing. 4" insertion depth, includes mounting screws
C$19.21 / each
0 In Stock
Weatherproof enclosure, ABS, compatible with Series 2000 Magnehelic®, DM-1000 DigiMag®, DM-2000, Series 605 (with -SS option), instruments with backwards compatible bezel option
C$502.19 / each
62 In Stock
4" 303 SS straight static pressure tip with flange, 1/4" hose barb.
C$15.18 / each
20457 In Stock
3-way vent valve, plastic, 1/8" NPT to 1/4" metal tubing, 80 psi rating, replaces former Model A-310 (brass). 2.3" x .8" x .1", .10 lb.
C$36.96 / each
224 In Stock
installation hardware
Mounting bracket flush mount Magnehelic® gage in bracket. Bracket is then surface mounted . Steel with gray hammertone epoxy finish. 6.3" x 7.7" x 4.0", 1.30 lb.
C$65.60 / each
1494 In Stock
Flat aluminum bracket for flush mounting Magnehelic® gage. 6.8" x 6.0" x .1", .35 lb.
C$57.63 / each
7 In Stock
Show Ratings & Reviews
Rated 3 out of
5
by
Daniel J from
Decent price but that's it
Instructions are vague, literally a business card size, website doesn't let you know that a power cord doesn't come with this and you need to make your own from something off Amazon. Definitively not plug and play.
Date published: 2025-12-04
Rated 4 out of
5
by
Vaughn from
These gauges are great!
Purchased two Digimag gauges for operating our paint booths. Very responsive and easy to install.
Date published: 2026-07-09
Rated 5 out of
5
by
Matt281 from
Great Products
When I first began my journey in the HVAC trade years ago, Dwyer temperature and pressure gauges were some of the first instruments I learned to work on. They were often already installed on the equipment I serviced, and over time I noticed something: whether I was checking pressure or temperature, it was almost always a Dwyer device. I rarely came across instruments from other manufacturers, and that consistency says a lot. Dwyer products are reliable, accurate, and straightforward to work with — qualities that make a real difference out in the field.
Date published: 2026-02-12
