 Encoder EM6422
Pulse emitter for positive displacement meters The pulse emitter “EM6422” converts the rotary motion of a Positive Displacement Flowmeter into electric pulses. It allows the meter to interface with ISOIL electronic counters (VEGA II, VEGA T).
EM6422 “type A” may be mounted directly onto all recently built ISOIL p.d. meters.
“Type B” may be mounted on all previous versions of
ISOIL meters by means of and adapter.
On demand, by means of dedicated flanges, it may be installed on meters from different brands.
EM6422 is made of an aluminum encasing divided into compartments, each separated from the other by an aluminum wall.
In one of the two compartments, a small shaft,
installed on a roller bearing, is connected at one end to the output shaft of the pd meter, while on the other end, close to the separating aluminum wall, the small shaft is connected to a magnet. Inside the adjacent compartment, another magnet detects the rotation of the small shaft and causes an electronic circuit to generate electric pulses.
Thus, there is no need in the p.d.meter for dynamic seals that sometimes cause leaks due to the wear over time.
Technical characteristics
| Housing material: |
Anodized aluminium alloy |
| Shaft material: |
Stainless steel (AISI 304) |
| Operating speed (input revolution): |
0÷1000 rpm |
| Cable/conduit entry: |
½” NPT |
| Gaskets: |
Viton (standard) or Nitrile (on request) |
| Weight: |
1000 gr |
| Mechanical protection: |
IP66 |
| Ex protection: |
II 2 G Ex d IIB T5 Gb |
| Working temperature: |
-20 ÷ +75°C : Viton Gaskets (standard);
-30 ÷ +75°C : Nitrile Gaskets (on request) |
| Humidity: |
0÷100 % non-condensing |
| Supply voltage: |
5÷30 VDC |
| Pulses resolution: |
64 pulses or 256 pulses/revolution |
| Operating: |
Bidirectional |
| Terminal block: |
Pull-out, 5 positions for wires (0,2÷1,5 mm2), shielded |
| Pulses Trasnmission |
|
| Current supply: |
40 mA max |
| Phase shift (A and B channel): |
90e° ±5% |
| Duty cycle: |
50/50 ±5% |
| Pulses output: |
Open drain FET. Pull-up resistor 4,7 K can be set by dip switch |
| Current sinking (A and B channel): |
50 mA for channel |
| CAN bus Transmission |
|
| Current supply: |
70 mA max |
| Serial communication: |
Interface: CAN bus |
| |
Speeds: 50/125 Khz by dip-switch selection |
| Identifiers: 21÷24 (Hex) by dip-switches selection |
|
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Encoder EM6422