FRG-700 Inverted Magnetron Pirani Gauge
11
Supply
DANGER
The gauge may only be connected to power sup-
plies, instruments or control devices that conform
to the requirements of a grounded protective extra-
low voltage (SELV-E according to EN 61010). The
connection to the gauge has to be fused
1)
.
Voltage at the gauge
15 … 30 VDC
(ripple
≤
1 V
pp
)
Power consumption
≤
2 W
Fuse
1)
≤
1 AT
Voltage at the supply unit with
maximum cable length
16 … 30 VDC
(ripple
≤
1 V
pp
)
2)
Adjustment
Potentiometer <HV>
Potentiometer <ATM>
adjustment under 10
-4
mbar
adjustment at atmospheric
pressure
Electrical connection
FCC68 socket, 8 poles
Sensor cable
8 poles, shielded
Line length
≤
50 m
(8
×
0.14 mm²)
Operating voltage
≤
3.3 kV
Operating current
≤
500 µA
Grounding concept
→
"Electrical Connection"
Vacuum connection –measuring
common
connected via 10 k
Ω
(max.
voltage differential with
respect to safety ±50 V
accuracy ±10 V)
Supply common – signal common conducted separately
1)
VARIAN controllers fulfill this requirement.
2)
The minimum voltage of the power supply unit must be increased
proportionally to the length of the sensor cable
