Cleaning The Pump Valve Assembly; Switch Test - Fluke 718Ex 30G User Manual

718Ex 30G/100G/300G
Users Manual

Cleaning the Pump Valve Assembly

1. Using a small screwdriver, remove the two valve
retention caps located in the oval-shaped opening on
the back side of the Calibrator.
2. Gently remove the spring and o-ring assembly.
3. Set aside the valve assemblies in a safe area and
clean out the valve body using a cotton swab soaked
in IPA (isopropyl alcohol).
4. Repeat this process several times using a new cotton
swab each time until there is no remaining residue.
5. Pump the unit several times and check again for
residue.
6. Clean the o-ring assembly and the o-ring on the
retention caps with IPA and inspect the o-rings closely
for any cuts, nicks, or wear. Replace if needed.
7. Inspect the springs for wear or loss of tension. They
should be approximately 8.6 mm long in the relaxed
state. If they are shorter than that, they may not allow
the o-ring to seat properly. Replace if needed.
8. Once all parts have been cleaned and inspected,
reinstall the o-ring and spring assemblies into the
valve body.
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9. Reinstall the retention caps and gently tighten the
cap.
10. Seal the output of the Calibrator and pump up the unit
to at least 50 % its rated pressure.
11. Release the pressure and repeat several times to
ensure that the o-rings seat properly.
The Calibrator is now ready to use.

Switch Test

To perform a switch test, follow these steps:
This example used a normally closed switch. The
procedure is the same for an open switch but the
display reads OPEN instead of CLOSE.
1. Connect the Calibrator mA and COM terminals to the
switch using the pressure switch terminals and
connect the pump from the Calibrator to the pressure
switch. The polarity of the terminals does not matter.
2. Make sure the vent on the pump is open and zero the
Calibrator if necessary. Close the vent after zeroing
the Calibrator.
Note