Michell Instruments Easidew Portable HP, Руководство пользователя, Страница: 10 / 32

Easidew Portable HP User’s Manual
4 97120 Issue 2.2, March 2016
OPERATION
3 OPERATION
!
Maximum operating pressure is 300 barg (4350 psig).
It is important that both the gas fi ttings and the Swagelok
®
tube fi ttings are correctly tightened before use.
Failure to do so will affect the instrument's pressure rating.
3.1 General Operation
To operate the Easidew Portable, follow these instructions:
1. Ensure that both the gas fi ttings and the Swagelok
®
tube fi ttings are fully
tightened before use.
2. For measurement at line pressure, connect the supplied metering valve to
the outlet of the instrument. For measurement at atmospheric pressure,
connect the metering valve to the inlet.
3. Gas under test should be restricted to fl ow rates between 1 and 5 Nl/min
(2 and 10.6 scfh) and pressures from atmospheric to 30 MPa (300 barg
/ 4350 psig).
4. Connect the sample gas supply line to the instrument Gas In port.
5. Connect the sample gas vent line to the instrument Gas Out port.
6. Switch the instrument on. The display will begin to change as the sensor
responds to the applied dew point.
7. Allow the gas to fl ow until the display shows a stable reading. Typically
this would be around 15 to 30 minutes for spot checks at dew points of
-40°C (-40°F) and above.
8. Switch the unit off and disconnect the sample lines.
!
Before disconnecting the Easidew Portable from the gas line
it is essential to vent the system to atmospheric pressure,
otherwise severe injury could result.
NOTE: Filters are essential for potentially dirty/contaminated gases – the
fi tted fi lter should be checked before and after use and replaced regularly - as
required.
NOTE: The High Pressure version features two gas fi ttings with 4mm orifi ces
that give no restriction and are engraved with a number 1. Atmospheric or
line pressure measurement is achieved by changing the positioning of the
metering valve as per the General Operation instructions above.