Installation, Operating & Maintenance Instructions
Series 651 DN 320-400 (I.D. 12“ - 16”), Logic
VAT Vakuumventile AG, CH-9469 Haag, Switzerland
Tel +41 81 771 61 61 Fax +41 81 771 48 30 [email protected] www.vatvalve.com
267736ED
2008-02-26
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2.5 Requirements to sensor connection
To achieve fast and accurate pressure control a fast
sensor response is required.
Sensor response time: < 50ms
The sensor is normally connected to the chamber by a
pipe. To maintain that the response time is not degraded
by this connection it needs to meet the following
requirements:
Inner diameter of connection pipe:
> = 10 mm
Length of connection pipe:
< = 300 mm
These conductance guidelines must include all valves
and limiting orifices that may also be present.
Make also sure that there is no obstruction in front of
sensor connection port inside the chamber.
The sensor should also be mounted free of mechanical
shock and vibration.
Dynamic stray magnetic fields may introduce noise to
sensor output and should be avoided or shielded.
2.6 Electrical
connection
2.6.1 Sensor supply concepts
This valve offers 3 alternative concepts to supply the sensor(s) with power. This depends on the sensor type and valve
version that is used. This valve is available with an optional sensor power supply module (SPS) that converts
±
15 VDC
from the 24 VDC.
Concepts:
•
Ex 24 VDC supplied to POWER connector is feed through to SENSOR connector to supply 24 VDC
sensors. Refer to chapter «2.6.2 Power and sensor connection (+24 VDC sensors)» for schematic and correct
wiring.
•
External
±
15 VDC supplied to POWER connector is feed through to SENSOR connector to supply
±
15 VDC
sensors. Refer to chapter «2.6.3 Power and sensor connection (
±
15 VDC sensors) without optional SPS module»
for schematic and correct wiring.
•
Ex 24 VDC supplied to POWER connector is converted into
±
15 VDC by the valve internal SPS and
supplied to SENSOR connector to supply
±
15 VDC sensors. Refer to chapter «2.6.4 Power and sensor
connection (
±
15 VDC sensors) with optional SPS module» for schematic and correct wiring.
Valve versions:
•
651 . . - . . G . - . . . . / 651 . . - . . H . - . . . .
SPS module not included
•
651 . . - . . A . - . . . . / 651 . . - . . C . - . . . .
SPS module included
Note: The SPS module can be retrofitted. Refer to chapter «Retrofit / replacement procedure» for instruction.