Re-Transmitted Output Current Range Set-Up; Figure 26 Confi Gure Analog Output - Michell Instruments Easidew Online User Manual

Easidew Online User's Manual
3.3.4

Re-Transmitted Output Current Range Set-Up

The Easidew Online is provided with an
analog current loop output module which
buffers and re-transmits the current loop
input signal from the dew-point transmitter.
By default, the re-transmission output is set
as a 4-20 mA current loop (to exactly follow
the input signal, i.e. 4 mA in, 4 mA out).
For certain system processes, a 0-20 mA
current loop output may be required. The
set-up method is as follows:
Figure 26
sequence.
To change output from 4-20 mA to 0-20
mA:
1. Press the
read
tECH
2. Press the
fl ash between
3. Press the  key and the display will
fl ash between
4. Press the
5. Press the  key once to display a
fl ashing 4 digit number. For the default
setting (4-20 mA) this will be 0001.
6. Press the  key once to change the
display to 0000. This selects the re-
transmission output to be 0-20 mA.
7. Press the
value. The output current loop is now
0-20 mA. The display will fl ash between
and
out1
8. Press the
main dew-point temperature display.
Note: The transmitter current loop output signal is now scaled at 6 mA per °C
input, while the transmitter input remains scaled at 7.5°C per mA.
Michell Instruments
shows the operational
key once, the display will
P
.
key and the display will
SET
and
ConF PinP
and
out1 ConF
key to display
SET oAt1
key to accept the new
SET
.
ConF
key once to return to the
P
key
.
.
.
Figure 26
OPERATION
P
SET
SET
Default setting
0001=4 to 20mA
New setting
0000=0 to20mA
SET
P
Main
Display
Confi gure Analog Output
31