Overview
The Series DM-1000 DigiMag replaces an analog mechanical gage with a field-programmable digital instrument. It can be programmed in 8 engineering units plus percent of full scale, so units can be changed on site without calculating conversions. All models are factory calibrated to a specific range.
Four menus reached from the MENU key give access to security level, engineering units, filter set point, peak and valley process readings, digital damping for erratic processes, display update rate to conserve battery life, and zero and span field calibration.
A filter set point can be entered so the display blinks when the reading crosses it, alerting the user that a maintenance action needs to occur. Power is flexible: the gage runs on 9-24 VDC line power or a 9V battery, and when both are connected the battery acts as backup if line power is lost or interrupted.
Specifications
| Model | DM-1109 |
| Range | 0 to 15 in w.c. |
| Resolution | 0.010 in w.c. |
| Service | Air and non-combustible, compatible gases. |
| Wetted Materials | Consult factory. |
| Housing Materials | Glass filled plastic. |
| Accuracy | +/-1% F.S. including linearity, hysteresis and repeatability. |
| Long Term Stability | +/-1% F.S. per year. |
| Thermal Effect | +/-0.05% F.S./F typical. |
| Temperature Limits | 0 to 140 F (-18 to 60 C). |
| Compensated Temperature Limits | 32 to 122 F (0 to 50 C). |
| Pressure Limit | 11 psi (75 kPa) |
| Display | 4-digit LCD, digits 0.60 in H x 0.33 in W. |
| Display Update | Selectable from 1 second to 10 minutes, or update only on button push. |
| Selectable Engineering Units | in w.c., psi, kPa, Pa, mm w.c., mBar, in Hg, mm Hg, and % of full scale (0-100%). |
| Digital Damping | Adjustable 1 to 15. |
| Power Requirements | 9V battery or external power supply 9-24 VDC. Battery included, shipped not connected. |
| Type of Battery | 9V alkaline (Duracell PC 1604 or equivalent). |
| Battery Service Life | 150 hours typical at 1 second display update; 9 months typical at 10 minute display update; 1.5 years typical with display update disabled. Up to four times longer with a lithium ULTRALIFE U9VL-J. |
| Current Consumption | 5 mA maximum. |
| Electrical Connections | Removable terminal block for 16 to 26 AWG. |
| Electrical Entry | Cable gland for 0.114 to 0.250 in (2.9 to 6.4 mm) diameter cable. |
| Process Connections | 1/8 in (3 mm) ID tubing. |
| Tubing Size | 3/16 in (4.8 mm) I.D. x 5/16 in (7.9 mm) O.D. flexible PVC tubing. |
| Panel Cut-Out | 4-9/16 in diameter panel opening; vertical mounting position required. |
| Enclosure Rating | NEMA 4X (IP66). |
| Size | 5 in (127 mm) O.D. front face; 2.33 in overall depth (dimensional drawing). |
| Weight | 1.18 lb (535 g). |
| Agency Approvals | CE; EN 61326-1 [Immunity Test Requirement for Industrial Environments] to IEC 61000-3-2, 61000-3-3, 61000-4-2, 61000-4-3, 61000-4-4, 61000-4-5, 61000-4-6 and 61000-4-11. |
Range in Selectable Engineering Units
| in w.c. | Pa | kPa | mbar | mm w.c. | psi | in Hg | mm Hg |
|---|---|---|---|---|---|---|---|
| 15.00 | 3738 | 3.738 | 37.38 | 381.0 | 0.543 | 1.104 | 28.02 |
Full-scale value of this model expressed in each selectable engineering unit. Units marked with a dash on the Dwyer model chart are not offered for this range and are omitted.
Applications
- Differential pressure across filters
- Fan control
- Static pressure in ducts or buildings
- Room pressurization monitoring
In the Box
- Mounting lugs - 3
- 6-20 x 2-1/2 in screws - 3
- 4-20 x 3/8 in screws - 3
- Cable gland - 1
- 9V alkaline battery - 1 (shipped not connected)
Optional Accessories
| A-286 | 4-1/2 in gage panel mounting flange |
| A-300 | Flat flush mounting bracket |
| A-480 | Plastic static pressure tip |
| A-489 | 4 in straight static pressure tip with flange |
Add the -NIST suffix when ordering for a NIST traceable calibration certificate (example: DM-1109-NIST).
Documentation
- Dwyer Series DM-1000 DigiMag Datasheet
- Dwyer Series DM-1000 Installation and Operating Instructions (Bulletin P-DM-1100)
Frequently Asked Questions
What is the pressure range of the Dwyer DM-1109?
The DM-1109 covers 0 to 15 in w.c. (0 to 3738 Pa), with 0.010 in w.c. resolution.
Can the Dwyer DM-1109 measure air velocity or flow?
No. Velocity and flow operation is not available on DM-1100 models. For air velocity or volumetric flow, use the corresponding DM-1200 model.
How accurate is the Dwyer DM-1109?
It is rated +/-1% F.S. including linearity, hysteresis and repeatability. Dwyer specifies +/-1% F.S. on ranges down to 2 in w.c. and +/-2% F.S. on the 1, 0.5 and 0.25 in w.c. ranges.
What units can the Dwyer DM-1109 display?
Eight engineering units plus percent of full scale: in w.c., psi, kPa, Pa, mm w.c., mBar, in Hg and mm Hg. Units are changed in the field from the OPEr menu, so no conversion arithmetic is needed.
How is the Dwyer DM-1109 powered?
A 9V alkaline battery or an external 9-24 VDC supply. The battery is included but shipped not connected. If both are connected the battery acts as backup when line power is lost.
How long does the battery last?
About 150 hours at a 1 second display update, about 9 months at a 10 minute update, and about 1.5 years with the display update disabled. A lithium ULTRALIFE U9VL-J can extend that up to four times.
Does the Dwyer DM-1109 fit a Magnehelic gage cut-out?
Yes. The gage is a 5 in O.D. front face and installs in a 4-9/16 in diameter panel opening, the same cut-out used by the analog Magnehelic gage. A vertical mounting position is required because that is the position the gage is calibrated in at the factory.
Can the Dwyer DM-1109 alert on a dirty filter?
Yes. A filter set point can be entered and the filter type set to HIGH or LOW, and the display blinks when the reading passes that set point. In 10 minute or on-touch display modes the LCD shows ALAr instead.
Specifications on this page are taken from Dwyer Series DM-1000 catalog page 25 and from Bulletin P-DM-1100, FR# 443779-00 Rev. 6 (2/19). One discrepancy is unresolved in Dwyer's own literature: the specification panel lists process connections as 1/8 in (3 mm) ID tubing, while the installation section states the integral connections are sized for 3/16 in (4.8 mm) I.D. x 5/16 in (7.9 mm) O.D. flexible PVC tubing. Both figures are shown above as printed; confirm with Dwyer before specifying tubing. Reviewed August 2026.
- Series:
- DM-1000 DigiMag
- Model Family:
- DM-1100
- Measurement Type:
- Differential Pressure
- Range Type:
- Unidirectional
- Pressure Range:
- 0 to 15 in w.c.
- Accuracy:
- +/-1% F.S.
- Display:
- 4-Digit LCD
- Enclosure Rating:
- NEMA 4X IP66
- Power Source:
- 9V Battery or 9-24 VDC
- Process Connection:
- Integral Tubing Ports
- Media:
- Air and Compatible Non-Combustible Gases
