Pressure Verification - Fluke 71 Series Calibration Manual

71X Series
Calibration Manual

Pressure Verification

To avoid a violent release of pressure or vacuum, always
depressurize the system slowly using the pressure/vacuum
release control before detaching any pressure line.
1. Carefully attach the pressure fitting of the deadweight tester to the pressure port of
2. Press the green O key to turn the calibrator on.
3. The display should read 0.00 PSI with the deadweight tester opened up to ambient
4. Depending if the instrument being tested is a 718(Ex) 1G, 30G, 100G, 300G, set up
5. Ensure the pressure has stabilized at each input before verifying the display reading.
6. Carefully vent all pressure and disconnect the calibrator from the deadweight tester.
When verifying vacuum pressure make sure the pressure/vacuum switch is
in the vacuum position. Forward (clockwise) is for pressure and backward
(counter-clockwise) is for vacuum.
Input
Pressure
0 psi
0.1 psi
0.2 psi
0.3 psi
0.4 psi
0.5 psi
0.6 psi
0.7 psi
0.8 psi
0.9 psi
1 psi
-0.2 psi
-0.4 psi
-0.6 psi
-0.8 psi
-1 psi
42
the Calibrator.
The use of TEFLON tape at the pressure fitting strengthens the seal.
air. If not, press the Z
the deadweight tester for the sequence of PSI inputs from Table 64 to be injected into
the pressure port of the Calibrator.
Table 64. 718 and 718Ex Pressure Verification
718 1G
Display
Reading
0.0005 to -0.0005
0.1005 to 0.0995
0.2005 to 0.1995
0.3005 to 0.2995
0.4005 to 0.3995
0.5005 to 0.4995
0.6005 to 0.5995
0.7005 to 0.6995
0.8005 to 0.7995
0.9005 to 0.8995
1.0005 to 0.9995
-0.1995 to -0.2005
-0.3.995 to -0.4005
-0.5995 to -0.6005
-0.7995 to -0.8005
-0.9995 to -1.0005
WWarning
Note
key until display does read 0.00 PSI.
Note
Input
Pressure
0 psi
6 psi
12 psi
18 psi
24 psi
30 psi
24 psi
18 psi
12 psi
6 psi
-12 psi *
718 and 718Ex 30G
Display
Reading
-0.015 to 0.015
5.985 to 6.015
11.985 to 12.015
17.985 to 18.015
23.985 to 24.015
29.985 to 30.015
23.985 to 24.015
17.985 to 18.015
11.985 to 12.015
5.985 to 6.015
-12.015 to -11.985