Preiffer PKR 251, Руководство по эксплуатации

Страница: 45 / 50

Parameter Value
Gauge identification Solely Pirani operation Resistance 11.1 kΩ against supply
earth
Combined Pirani/cold cathodes
operation
Resistance 9.1 kΩ against supply
earth
Conditions to be complied with in this regard:
● The polarity of Pin 1 must always be positive against supply earth.
● Measurements with constant current: Measurement current in the
range of 0.2 – 0.3 mA
● Measurements with constant voltage: Measurement voltage within the
range 2 – 3 V
Supply voltage At gauge 15.0 – 30.0 V DC
on the supply unit with max. ca-
ble length
6)
16.0 – 30.0 V DC
Ripple max. 1 V
pp
Operating voltage (in the measurement chamber) ≤ 3.3 kV
Operating current (in the measurement chamber) ≤ 500 μA
Power consumption ≤ 2 W
Fuse (to be connected in series)
7)
≤ 1 AT
Connection (electrical) Hirschmann GO 6 (6-pin, pins)
Measurement cable 5-pin, including shielding
Cable length
Max. 75 m (0.25 mm 2 /conductor)
max. 100 m (0.34 mm
2
/conductor)
max. 300 m (1.0 mm 2 /conductor)
Grounding concept (see chapter “Establishing electric connection”, page 20)
Vacuum connection and signal
ground
Connected with 10 kΩ (max. differen-
tial voltage with regard to safety
± 50 V, with regard to accuracy ± 10 V)
Supply earth and signal earth Routed separately; differential meas-
urement recommended for longer ca-
ble lengths (≥ 6 m)
Tbl. 13: Electrical data
Parameter Value
Internal volume
approx. 20 cm 3
Weight 700 g (ISO-KF)
950 g (CF-F)
Tbl. 14: Internal volume and weight
Parameter Value
Relative humidity of air At temperatures up to +31°C max. 80 %
At temperatures up to +40°C max. 50%
Mounting orientation Arbitrary
Usage Only in indoor areas
Installation altitude max. 2000 m MSL
Protection degree IP40
Tbl. 15: Ambient conditions
6) The minimum voltage for the supply unit must be increased proportional to the cable length.
7) Pfeiffer Vacuum measuring and control units comply with this requirement.
Technical data and dimensions
45/50