Introduction
The Series DM-1000 DigiMag® Digital Differential Pressure Gage is designed as a modern replacement for analog mechanical pressure gauges. It offers enhanced versatility with field-programmable engineering units, allowing users to select from eight commonly used units plus percent of full scale, eliminating the need for manual calculations. A key feature for filter applications is a programmable set point that causes the display to blink when the filter is dirty, alerting the user to maintenance needs.
Programming the DM-1000 is user-friendly via a menu key that accesses four simplified menus for security level, engineering units, filter set point, peak/valley readings, digital damping, display update rate, and zero/span calibration.
The gage provides high accuracy, typically ±1% of full scale on ranges down to 2" w.c., and ±2% on lower ranges (1" to 0.25" w.c.). It supports bi-directional ranges and offers flexible power options, operating on 9-24 VDC line power or a 9V battery. When both are connected, the battery serves as a backup.
Specifications
- Service: Air and non-combustible, compatible gases.
- Wetted Materials: Consult factory.
- Housing Materials: Glass filled plastic.
- Accuracy: ±1% F.S. (linearity, hysteresis, repeatability); ±2% F.S. for ranges 1" w.c. and below.
- Temperature Limits: 0 to 140°F (-18 to 60°C).
- Compensated Temperature Limits: 32 to 122°F (0 to 50°C).
- Long Term Stability: ±1% F.S. per year.
- Thermal Effect: ±0.05% F.S./°F typical; ±0.10% F.S./°F for ranges 1" w.c. and below.
- Display: 4-digit LCD (0.60"H x 0.33"W digits).
- Display Update: Selectable from 1 second to 10 minutes, or manual update via button press.
- Pressure Limits: For ranges 5" w.c. and lower: 2 psi (13.7 kPa). For ranges 10" w.c. and higher: 11 psi (75 kPa).
- Selectable Engineering Units: in w.c., psi, kPa, Pa, mm w.c., mBar, in Hg, mm Hg, FS (0-100%).
- Power Requirements: 9V battery or external power supply 9-24 VDC. Battery included but not connected.
- Battery Type: 9V alkaline battery (e.g., Duracell® PC 1604).
- Battery Service Life: Varies with display update setting: 150 hours (typical) for 1-second update; 9 months (typical) for 10-minute update; 1.5 years (typical) with display update disabled. Lithium batteries may extend life up to four times.
- Current Consumption: 5 mA maximum.
- Electrical Connections: Removable terminal block for 16 to 26 AWG wire.
- Electrical Entry: Cable gland for 0.114 to 0.250" (2.9 to 6.4 mm) diameter cable.
- Process Connections: 3/16" I.D. tubing (5 mm I.D.), maximum O.D. 3/8" tubing.
- Enclosure Rating: NEMA 4X (IP66).
- Weight: 1.18 lb (535 g).
- Size: 5" (127 mm) O.D. front face.
- Agency Approvals: CE, EN 61326-1 (Immunity Test Requirement for Industrial Environments) with specified EMC standards (IEC 61000-3-2, -3-3, -4-2, -4-3, -4-4, -4-5, -4-6, -4-11).
Installation
The gage requires a vertical mounting position, which is its factory calibration orientation. A 4-9/16" diameter opening is needed in the panel. The gage is secured using provided screws and adapters.
Included Accessories:
- Mounting lugs (3)
- 6-20 x 2-1/2 screws (3)
- 4-20 x 3/8 screws (3) (mounting hole depth 3/8" [9.53])
- Cable gland (1)
Diagram Description: A dimensional drawing shows the overall diameter, pressure connection ports (labeled '+' and '-'), and mounting hole locations for both standard and flange mounting.
Pressure Connections: Two integral tubing connections are located on the back. They accommodate 3/16" (4.8 mm) I.D. x 5/16" (7.9 mm) O.D. flexible PVC tubing. For single positive pressure, connect to the '+' port and vent the '-' port. For vacuum, connect to the '-' port and vent the '+' port. For differential pressure, connect higher pressure to '+' and lower pressure to '-'. Ensure tubing pressure ratings exceed operating ranges.
Electrical Connections: The unit can be powered by a 9V battery or an external 9-24 VDC power supply. The battery acts as a backup if line power is interrupted.
Battery Installation: The unit ships with a separate 9V battery. Remove the top back cover, connect the battery to the holder, and replace the cover, tightening screws to 2 ±.25 in. lbs.
External Power Supply Installation: Remove the unit's back cover and connect the external power supply to the terminal block.
Caution: Ensure power is OFF during wiring. Do not exceed specified supply voltage ratings to prevent permanent damage.
Figure 1 Diagram Description: Illustrates the connection of a 9V battery and an external 9-24 VDC power supply to the unit's terminals, showing the battery as a backup.
Operating Instructions
The gage features a menu system accessible via front panel buttons: MENU, UP (⬆️), DOWN (⬇️), and ENTER (E).
Key Functions:
- MENU: Allows access to menus. In the Home Position, it returns to the Home Position. In a Sub Menu, it returns to the previous menu.
- UP (⬆️): Displays pressure readings instantly (in RATE KEY MODE only). Sequences through menus. Increments a value.
- DOWN (⬇️): Sequences through menus. Decrements a value.
- ENTER (E): Displays full scale range of the unit. Enters SUB MENU. Changes a value or setting: press ENTER, adjust with UP/DOWN arrows, press ENTER again to save.
Menu Map Diagram Description: A flowchart shows the navigation. From the Home position, pressing MENU accesses MAIN MENUS: Security (SECr), Operation (OPEr), Display (diS), and Advanced (AdU). Each main menu has SUB MENUS for specific settings like security level, units (e.g., PrES-INWC), filter type (FILt), damping (DAMP), display update rate (rAtE), peak/valley values (PEAK, VALY), and calibration (Auto ZERO, CAL-SPAN).
Programming Instructions:
- Security Menu (SECr-MENU): Access by holding MENU until Security Menu appears. Press E to access SUB MENU (SECr-0001). Security levels (1-3) control menu access. A password is required for certain levels.
- Operation Menu (OPEr-MENU): Access by holding MENU until Security Menu appears, then pressing UP until OPEr-MENU is shown. Press E to access SUB MENUS. The primary sub-menu is PrES-INWC (Pressure-Unit). Users can select desired pressure units from a list (in w.c., psi, kPa, Pa, mm w.c., mBar, in Hg, mm Hg, FS).
- Display Menu (diS-MENU): Access by holding MENU until Security Menu appears, then pressing UP until diS-MENU is shown. Press E to access Display SUB MENUS. Options include:
- Filter Type Setting (FILt): OFF, HIGH (blinks above set point), LOW (blinks below set point).
- Filter Point Setting (SPPT): Set a specific pressure value for filter alerts.
- Damping Setting (DAMP): Adjust damping level (1-15) to stabilize readings affected by vibration or pressure fluctuations.
- Display Update Setting (rAtE): Normal (1 second), 10 minutes, or KEY (manual update on button press).
- Peak and Valley Setting (PEAK, VALY): Stores highest (PEAK) and lowest (VALY) pressure readings since last reset or power-up. Can be manually reset.
- Advanced Menu (AdU-MENU): Access by holding MENU until Security Menu appears, then pressing UP until AdU-MENU is shown. Press E to access SUB MENUS. Options include:
- Auto ZERO: Calibrates the zero point. Ensure no pressure is applied.
- CAL - SPAN: Calibrates the full-scale reading by applying a known pressure.
Table 1: Pressure Range vs. Available Units
| in w.c. | psi | kPa | Pa | mbar | mm w.c. | in Hg | mm Hg | % of Resolution (in w.c.) | |
| 0.250 | 0.062 | 62.20 | 0.622 | 6.35 | 0.467 | 100.0 | 0.001 | ||
| 0.500 | 0.124 | 124.5 | 1.245 | 12.70 | 0.934 | 100.0 | 0.001 | ||
| 1.000 | 0.249 | 249.1 | 2.492 | 25.40 | 1.868 | 100.0 | 0.001 | ||
| 2.000 | 0.498 | 498.2 | 4.982 | 50.80 | 3.736 | 100.0 | 0.001 | ||
| 5.000 | 0.181 | 1.245 | 1245 | 12.45 | 127.0 | 0.368 | 9.34 | 100.0 | 0.002 |
| 10.00 | 0.361 | 2.491 | 2491 | 24.91 | 254.0 | 0.736 | 18.68 | 100.0 | 0.010 |
| 15.00 | 0.543 | 3.738 | 3738 | 37.38 | 381.0 | 1.104 | 28.02 | 100.0 | 0.010 |
| 25.00 | 0.903 | 6.227 | 6227 | 62.27 | 635.0 | 1.839 | 46.71 | 100.0 | 0.010 |
| 50.00 | 1.806 | 12.45 | 1245 | 1270 | 3.678 | 93.42 | 100.0 | 0.020 | |
| 100.0 | 3.613 | 24.91 | 2491 | 2540 | 7.355 | 186.8 | 100.0 | 0.100 |
Note: OFL (over flow) or UFL (under flow) will appear when the low and high range levels have been exceeded by 10% F.S.
Notes on Display Update and Battery Life:
- Battery life varies significantly with the display update setting: 150 hours (typical) for 1-second updates (rAtE-NORM), 9 months (typical) for 10-minute updates (rAtE-10), and 1.5 years (typical) when updates are disabled (rAtE-KEY).
- If display updates are set to 10 minutes or disabled, process pressure can be read instantly by pressing and holding the UP (⬆️) button. The LCD will display "ALAr" if the filter point has been exceeded.
Maintenance
This model is not designed for field service. If repair is needed, the unit should be returned. Field repairs are not recommended and may void the warranty. When returning the unit, include a brief description of the problem and any relevant application notes. Contact customer service to obtain a return goods authorization (RGA) number before shipping.
Contact Information
DWYER INSTRUMENTS, INC.
Phone: 219/879-8000
Fax: 219/872-9057
Email: information@itm.com
Website: www.dwyer-inst.com
Address: P.O. BOX 373, MICHIGAN CITY, INDIANA 46360, U.S.A.
Customer Support Line: 1.800.561.8187
