DDM-EM Orifice Plate Flow Meter With Digital Display
- Lead Time: 4 ~ 6 weeks
- For liquids and gases
- From ND50 to ND200, or BSP ¼” up to 2”
- Mounting: Vertical or horizontal piping
- Output 4-20 mA (0-10 V on request)
- 2 Adjustable contacts, NO / NC
- LED display (remote unit: on request)
| Measuring Principle: | Differential pressure of an orifice plate |
| Differential Pressure: | Air: 5 to 1000 mbar Water: 100 to 1000 mbar |
| Pressure Drop: | ≈30 to 60 % of differential pressure |
| Nominal Pressure: | PN 16 (Caution with the pressure limit of the display unit) |
| Ambient Temperature: | -10 to +70 °C |
| Fluid Temperature: | Standard: -10 TO+70 °C With thermic isolation: 130 °C The fluid must not freeze. Option ”HT”: above 130 °C |
| Protection: | IP 65, according DIN EN 60529 |
| Nominal Pressure: | 5 % F. S. |
| Fittings: | |
| Wafer Mounting, Between Flanges: | PN10 or PN16 according DIN EN 1092-1, shapes A & B |
| Unions (Rp): | Two pieces – Female thread DIN EN 10226-1 (ISO 7-1) cylindrical |
| Female Thread (Gi): | Cylindrical BSP DIN EN ISO 228 (BSP) |
| Male Thread (Ga): | Cylindrical BSP DIN EN ISO 228 T1 |
| Materials: | |
| DDM-EM-DN: | Body: S355 (Option AISI 316 Ti ) Corrosion protection: Epoxy powder coating, traffic blue (RAL 5017) glossy Corrosion class: C2 Orifice plate: AISI 316 Ti (1.4571) |
| DDM-EM- Rp, Gi, Ga: | Fittings: Malleable cast iron; Option for Rp only: zinc plated Orifice plate: Brass Seals: NBR (other on request) |
| Connection between orifice and transmitter: | Ducts, straight, to screw on, ¼”: Nickel plated brass (On request: AISI 316 Ti) BSP fittings ¼” / Ø 8: Nickel plated brass (On request: AISI 316 Ti) Couplings, nuts: zinc plated steel (On request AISI 316 Ti) Sealing: Gland, steel zinc plated with NBR seal |
| Display unit EM: | Wet parts: FPM, NBR, brass Diaphragm: NBR Housing: Polyamide PA 6.6 |
DDM-EM orifice plate flowmeter works according to the principle of differential pressure which is proportional to the square of the volume rate of flow through the pipeline. The DDM series integrates an orifice plate inside an armature for wafer mounting or with threaded fittings.
The transmitter EM contains a diaphragm system. The differential pressure generates a force which moves the diaphragm system against the measuring spring. The resulting movement is transmitted to the inductive transducer via a piston. The electronics convert the signal into a direct display, switching contact and output signal.
The reliability of the measurement depends of the flow behaviour at the measuring point. The region of steady flow should covers piping distances of 6 ND upstream and 4 ND downstream.
Several versions in steel, stainless steel or brass are available:
- DDM-DN Wafer for flanges acc. DIN EN 1092-1
- DDM-Gi Female threads acc. DIN EN ISO 228
- DDM-Ga Male threads acc. DIN EN ISO 228
- DDM-Rp Unions DIN EN 10226-1 (ISO 7-1)
Every BAMO Kirchner instrument is tested in conformity with EC directives.
The corresponding declaration of conformity is available on request.
The current version in force is available on our WEB site.
The production center Kirchner, is certified DIN EN ISO 9001: 2015