Easidew Plus Portable Hygrometer User’s Manual
6
97478 Issue 1, October 2014
OPERATION
3.4
User Controls
°Cdp
Power
Fuse
4-20
mA
O/P
Battery
Level
Battery
Charger
To measure
at
line
pressure
atmospheric
pressure
Gas Out
Gas In
2
1
2
1
o
-
BATTERY
Gas Out
Gas In
Filter Fitted
2
1
3
4
5
6
7
Figure 2
User Controls
1
Digital Display
Indicates the measured dew point in °F or °C from -58 to +68°F
(-50 to +20°C).
Under certain conditions the following error messages may be
displayed:
ErrL
= Sensor under range
ErrH
= Sensor over range
Err I
= Sensor fault or sensor disconnected
2
Power Switch
Switches the Easidew Plus Portable Hygrometer ON or OFF.
3
Fuse
This 1A quick blow fuse provides protection for the display
electronics in the event of a fault with the charger or battery
pack. Another protection fuse is located on the display PCB.
4
NiMH Battery
Pack
Located in the top right hand corner of the instrument, it can be
accessed by removing two screws (5). The battery pack can be
recharged using the supplied charger, via the battery-charging
socket and should be recharged whenever the battery level
meter is in the red region. See Section 5.6 for troubleshooting
information.
The battery pack will charge if the instrument is switched ON or
OFF. However, the battery level meter will only indicate when
the instrument is switched on.
6
Analog Output
Socket
The Easidew Plus Portable Hygrometer features an analog
output socket that provides a linear 4-20 mA current loop,
scaled to -76 to +140°F (-60 to +60°C) dew point. This allowed
the instrument to be connected to a chart recorder, data logger
or PC to enable dew-point trends to be analyzed over time.
7
Gas Fittings
The Easidew Plus Portable Hygrometer can be used for
measurements at line pressure (up to 4350 psig (300 barg))
or atmospheric pressure. Swagelok
®
tube fittings are supplied
for use with 1/4" OD stainless steel tube. There is a 32mm
particulate filter (99.5% removal of 0.1 micron particles)
installed as standard under the
Gas In
port position.
