59
FILTER: This feature filters out the pulsations in the pressure signal due to the peristaltic nature of
the pump head. This provides better control and easier to read values, as well as improved graphed
data. Select from 1 to 7, 1 = no signal filter,
7 = maximum filter. Default = 4.
5.7
Setup: Pressure Sensor, Calibration
The LabTec™ has built in calibration curves for the SciPres
®
pressure sensors that are
inherently very accurate for the installed default range of 0 – 60 psi (0 - 4.14 bar), and there should be
no need for you to change it. If your metrology department insists that they calibrate them periodically,
the
procedure follows.
To calibrate the LabTec™ / SciPres
®
Sensors:
1.
Obtain a NIST traceable regulated source of compressed gas (i.e. air, nitrogen) and pressure
gauge.
2.
Go to Mode Select; Setup; Pressure Sensor, then to Pressure: Range, and note the range
specified, change if desired. Default is 60 psi (4.14 bar).
3.
Press Exit and scroll to Pressure: Zero.
4.
Choose P1.
5.
With no pressure on the sensor, press Zero (“A” button).
6.
Connect regulated pressure source to P1, and carefully increase to match range noted in step 2.
7.
Press Span (“B” button).
8.
Turn off pressure source, Press exit.
9.
Repeat steps 5 – 8, choosing P2 and then P3.
10.
You have now recalibrated (spanned) all 3 SciPres
®
sensors. It is still advisable to zero each
sensor again with no pressure in the system, prior to running your tests via the Edit: Press.
Sensor menu in the operating mode of choice.
Note: Do not Zero P1, P2 or P3 unless a sensor is connected. This will cause the sensor to read
0.0 all of the time, regardless of the actual pressure.
Note: Pressurizing the SciPres
®
Sensors beyond 60 psi (4.14 bar) can damage the sensor.
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