256 Pneumatic Indicator Q&A
Question: Do you have some short instructions for using this indicator?
Answer: Short Instructions for Reading Twin-Tube Piezometer
- Before leaving office, check that the indicator has enough gas.
- At the site, turn flow control valve to Vent and zero the pressure gauge.
- Turn flow control valve Off.
- Wipe off all dirt and moisture from the transducer tubing and connectors.
- Connect the quick connect plug to Transducer socket and vent tube to
the return flow indicator.
- Turn tank control valve On, then turn the regulator knob clockwise until
pressure reaches the rating of the gauge. 7. Turn flow control valve On.
- Adjust the flow rate knob so that the pressure reading on the main gauge
rises at about 1 PSI per second.
- Wait until ball in return flow indicator shows a return flow of gas from
the transducer, then turn flow control valve Off.
- Wait until pressure reading stabilizes, then tap gauge and write down
- To verify, briefly turn flow control valve to Vent, then return to On.
This changes the pressure reading. Now take a second, verification reading.
Question: The supply pressure doesn't stay constant. Is something wrong with
Answer: Try these diagnostic steps.
- Make sure the internal tank has adequate pressure and the tank control
valve is ON.
- With no piezometer attached, set the supply
pressure regulator to 100 psi.
- Turn the flow control
valve ON, and open the flow rate valve until the digital gauge reaches
the flow control valve OFF. The digital gauge should settle around 100 psi.
(Supply regulated pressure).
- If the the pressure drops below 100 psi, there is indeed a problem
with the indicator. If the pressure is maintained at 100 psi, there is
probably a problem with the piezometer connection, the piezometer tubing,
or the piezometer itself.
Question: I lost the manual for my Meriam Smart Manometer, which
is the digital gauge used in the 256 Indicator. Do you have a replacement
Answer: Yes. Follow this link: Download the Meriam manual.