Thermo Scientific 5028i, Instruction Manual

Page: 147 / 330

Calibration
Calibration Procedure
Thermo Fisher Scientific Model 5028
i
Instruction Manual 4-5
The Calibrate Vacuum Pressure Span screen allows the user to view and
set the vacuum sensor calibration span point.
To calibrate the vacuum sensor, zero a digital manometer (capable of
measuring up to 100 mmHg) to the +
D
P port on the rear panel. Then
push the toggle switch on the right inward to open (see Figure 4–1 ).
The manometer reading can now be used to calibrate the vacuum
sensor. + D PA port uses for Channel A, and + D PB port uses for Channel
B.
Figure 4–1. Differential Pressure and Vacuum Calibration Ports
l
In the Main Menu, choose Service > Pres/Vacuum Calibration >
Vac/Flow or Vac/Flow B > Vac Pres Span . Vac/Flow B settings please
refer to Vac/Flow as following description.
The Flow Pressure Span screen allows the user to view and set the flow
sensor calibration span point.
To calibrate the flow pressure sensor span point, the instrument must
be pulling an active flow through the filter tape. By use of a manometer,
connect the resp/- ports of your NIST-traceable manometer to
the respective rear panel +/- ports. (Please be certain to zero any digital
manometers prior to connecting!) Open the ports by pressing the
toggle switches inward. Calculate an average reading from the reference
manometer in units of mmHg. +/- D PA ports use for Channel A, and
Calibrate Vacuum Pressure Span
Calibrate Flow Pressure Span