Easidew Plus Portable Hygrometer User’s Manual
4
97478 Issue 1, October 2014
OPERATION
3
OPERATION
!
Maximum operating pressure is 4350 psig (300 barg).
It is important that the gas fittings are correctly tightened, and
any tubing is secure in the push fittings before use.
Failure to do so will affect the instrument's pressure rating.
3.1
Instrument Gas Connections
Sample gas connections are made via the Gas in and Gas out ports located on
the front of the instrument. Each of these ports is equipped with an adaptor (3) which
screws into each gas port.
Two types of adaptors are supplied; a small bore orifice to allow sample gas either in
or out of the instrument and two larger bore orifices. Both types of adaptor have a ⅛”
NPT internal thread to accommodate the customer’s choice of Gas input and Gas output
connection fittings.
A range of connection fitting options is available.
Depending upon whether measurements are to be taken at atmospheric pressure
or line pressure, the adaptors need to be installed as shown in Figure 1A.
Readings at atmospheric
pressure
Readings at line pressure
System pressures from 15-150
psig (1-10 barg)
Inlet: Small Orifice (#2) Inlet: Large orifice (#1)
Outlet: Large Orifice (#1) Outlet: Small Orifice (#2)
System pressures from 150-350
psig (10 - 300 barg)
Large orifice (#1)
Small orifice (#2)
Figure 1A
Adaptor Fittings
3.2
General Operation
To operate the Easidew Plus Portable Hygrometer, follow these instructions:
1. Insure that both the gas fittings and the Swagelok
®
tube fittings are fully
tightened before use.
2. For measurement at low pressure or atmospheric pressure, no valving is
necessary.
3. For measurement at high pressure (150 psig to 4350 psig / 10-300 bar),
connect the supplied metering valve to the outlet of the instrument.
4. Gas under test should be restricted to flow rates 2 and 10 scfh (between
1 and 5 Nl/min) and pressures from atmospheric to 4350 psig (300 barg).
5. Connect the sample gas supply line to the instrument
Gas In
port.
6. Connect the sample gas vent line to the instrument
Gas Out
port.
