VACUUBRAND MZ 2S NT User Manual
Page 44
Notes prior to the use of the manometers (ME 4R NT)
The manometers are filled with glycerin. The overpressure manometer
indicates the overpressure relative to the atmospheric pressure at the
place of operation. The vacuum meter indicates the underpressure rela-
tive to the atmospheric pressure at the place of operation but with abso-
lute scaling.
+
Install the pump in the room of operation.
+
Vent the reference chambers prior to use. Else, not venting the ma-
nometers may lead to a systematic measuring error.
There are different types of manometers. To vent the reference chamber
check which types of manometers are installed at the pump and proceed
according to the given instructions:
A: Manometer with bore at the rear side
Pierce the hole at the rear side of the mano-
meter. Some outflow of liquid is normal.
+
Do not tilt pump during transport.
B: Manometer with pin
Lift the pin to vent the manometer. Do not re-
move the pin completely! Close after venting.
+
Repeat if necessary until the dial shows
ATM with the measuring connection at at-
mospheric pressure.
pin
bore
C: Manometer with pressure compensation
valve
Vent the manometer using the pressure com-
pensation valve. Close the valve after ventilation.
+
Repeat if necessary until dial shows zero
with measuring connection at atmospheric
pressure.
D: Manometer without bore, pin or pressure
compensation valve
Do
not vent the reference chamber of this ma-
nometer!
pressure
compensation
valve