Preliminary System Test; Mounting The Sample Block And Transmitter; Sample Block Gas Connections - Michell Instruments Easidew Online User Manual

INSTALLATION
2.8.3

Preliminary System Test

Before wiring the external signal outputs and the transmitter (current loop open),
perform a system check as follows:
1. Switch off and disconnect the power supply.
2. Connect to an AC or DC supply and switch the supply
display should come on. Depending on the version of the monitor there
are 2 types of sequential messages appearing on the display.
Type 1: - Digits sequentially tested, each in turn displaying the fi gure
followed by
Type 2: - Digits sequentially tested, each in turn displaying the fi gure
followed by
The ºCdp LED will, by default, also be illuminated and it is possible, that
even though no alarms are currently set-up, one of the alarm LED's may be
illuminated.
NOTE: If the instrument is confi gured to read ppm
temperature LED indicators will be lit.
3. If a loop calibrator is available, set it to Ext loop and connect to terminal
4 (positive) and terminal 3 (negative) of the process indicator.
4. Set the output current of the loop calibrator to 4 mA, the display should
now be reading
5. Set the output current of the loop calibrator to 20 mA, the display should
now be reading
6. Switch off and disconnect the loop calibrator.
Before wiring the external signal outputs and the transmitter, perform a system check
as follows:
2.9

Mounting the Sample Block and Transmitter

2.9.1

Sample Block Gas Connections

Sample gas connections are made to the Gas In and Gas Out ports on the sample block
see Figure 12. Either port on the sample block may be used as the Gas Input port (i.e.
for connection purposes the ports are interchangeable).
Normally, connections are made via stainless steel pipework, in which case the sensor
block/transmitter assembly will be self supporting. If Tefl on tubing is used it may be
necessary to support the assembly with a body clip.
14
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Easidew Online User's Manual
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97094 Issue 18.5, March 2016
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