Easidew Online User’s Manual
Michell Instruments 1
INTRODUCTION
1 INTRODUCTION
The Easidew Online dew-point hygrometer is an instrument designed for the continuous
online measurement of moisture content in non-corrosive gases, over an operational
range of -100 to +20ºCdp (-148 to +68ºFdp).
The system comprises a programmable monitor confi gured to accept a 4-20 mA current
loop signal from an impedance-type dew-point temperature measurement transmitter.
The span of the transmitter is set to cover the dew-point range -100 to +20ºCdp (-148
to +68ºFdp) at operating pressures up to 45 Mpa (450 barg / 6500 psig).
The monitor also has a re-transmission facility which buffers the transmitter output for
onward transmission to other systems. The transmitter input to the monitor is confi gured
as a 4-20 mA current loop signal and the re-transmitted output can be confi gured as
either a 4-20 mA or a 0-20 mA current loop signal (ranged as per the input).
Two alarm outputs (high and low) are provided for connection to external systems.
Alarm 1 provides a set of single pole make contacts and Alarm 2 provides a set of
changeover contacts. Both sets are potential free and Alarm 1 contacts (single pole
make) are rated at 250 V, 3 A and the Alarm 2 contacts (changeover) are rated at
250 V, 5 A.
Figure 1
shows the monitor and the transmitter.
°Cdp
°Fdp
Easidew Online
Hygrometer
Figure 1
Easidew Online Monitor and Transmitter
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