Easidew Online User’s Manual
Michell Instruments 35
OPERATION
3.4.4 Scale Units to ppm
V
Set-Up
To change the monitor to read parts per million by volume (ppm
V
) proceed as follows:
Figure 29
shows the operational key sequence.
NOTE: The dew-point transmitter must be confi gured to provide an output
proportional to ppmV which can be set up at the time of order or by using the
Michell application software. Contact Michell Instruments for information
(for contact details see www.michell.com).
1. Press the
P key once, the display will read tECH.
2. Press the
SET key four times and the display will read dPnt.
3. Press the key, the display will fl ash the current decimal point position
(0001).
4. Press the key to set 0000 on the display (no decimal point), and press
the
SET key twice. tPoL is then displayed.
5. Press the key, the display will fl ash the current minimum span limit
(-1000)
6. Use the and keys to set the required ppmV minimum reading (0000)
and press the
SET key. tPoH is then displayed.
7. Press the key, the display will fl ash the current maximum span limit
(0200).
8. Use the and keys to set the required ppmV maximum reading (3000)
and press the
SET key twice. unit is then displayed.
9. Press the key, the display will fl ash the current unit (°C).
10. Press the key three times to set the display reading to ‘_’ (ppmV) and
press the
SET key. LoL is then displayed.
11. Press the key, the display will fl ash the current alarm lower range limit
(-1000) (formerly -100.0 with no sign or decimal point showing).
12. Use the and keys to set the required alarm lower range limit (point
where display starts to fl ash) (0 or different value), and press the
SET
key.
uPL is then displayed.
13. Press the key, the display will fl ash the current alarm upper range limit
(0200) (formerly 020.0 with no decimal point showing).
14. Use the and keys to set the required alarm upper range limit (point
where display starts to fl ash) (3000 or different value), and press the
SET
key.
PUoF is now displayed.
15. Press the
P key twice and the main display, now reading ppmV will show.
NOTE: Neither the °C nor the °F LED indicators on the front panel
of the monitor are now lit.
On completion of the above procedure, appropriate alarm levels (relevant to the new
ppm
V
scale) will need to be set-up (refer to Section 3.4.3).
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