ENMET PPM Formaldemeter™ htV-m - Manual (Page 15)

Formaldemeter
htV-m
ENMET Corporation
13
6 Troubleshooting
6.1 Diagnosing the problem
' -- -- -- -- ' flashes on display and the instrument will not sample.
The three main reasons for this problem are:
1. The instrument has been accidentally calibrated when no calibration standard was present.
2. The calibration standard used for calibration has expired.
3. The instrument has been damaged and will need to be repaired.
To determine which of the reasons applies to your case follow the procedures shown below
(Note - quoted values are for tests performed at 25oC):
1. Make sure that the instrument has been turned off for about 5-minutes.
2. Hold down the Left-hand calibration button whilst turning the
htV-m
on.
3.
tESt will appear on the display. Release all the buttons.
4. A four-digit value will appear ( #.### ). Give the
htV-m
a few seconds to stabilize.
5. Note the initial value and an approximate rate of change over a minute. If the initial value or the rate of change is over 0.300
then it is likely that your sensor has been damaged - contact
ENMET Corporation for further details.
If the readings look OK then continue with the
htV-m
still in the
tESt mode:
1. With the sample nozzle inserted into a valid calibration standard take a sample.
2. The display should be set to
0.000 as the pump starts to run and then rise up to a maximum as the sample is drawn in.
3. Press and hold the Left-hand calibration button - the display will show a time value (
t #.#). Make a note of this.
4. Press and hold the Right-hand calibration button - the display will show the peak value. Make a note of this too.
5. Turn the instrument off. Leave the instrument off for 5-minutes before repeating the tests.
If the peak value is less than 5.000 or has a time value less than 5 seconds then there may be problem with the sampling system
or your sensor. Contact
ENMET Corporation for further details.
6.2 Checking the Gain
1. Make sure that the instrument is turned off.
2. Hold down the Right-hand calibration button whilst turning the instrument on.
3.
GA1n will appear on the display. Release all the buttons.
4. A four-digit value will alternate with a two-digit exponent on the screen: (
#### 1E: ##)
5. Note both numbers. The instrument will power down after a few seconds.
If the Exponent value is between
1E:15 and 1E:13 then you may have used an expired standard - check your standard expiry
date and re-read Section 4.4 on how to calibrate the instrument. When you are ready carry out a RE-SET , as described below,
and recalibrate the instrument.
If the Exponent value is less than
1E:13 then you may have accidentally calibrated without a calibration standard being present.
Carry out a RE-SET as described below.
6.3 Performing a full re-set of the instrument
Make sure that you have a valid calibration standard to hand before performing this procedure as your current calibration will
be deleted, and there is no way of 'undoing' the
RE-SET procedure once it has been performed.
1. Make sure that the instrument is turned off.
2. Hold down both Cal (
▲ and ▼) buttons whilst turning the instrument on.
3.
rSEt will appear on the display. Release all the buttons.
4.
-no- will appear on the display. Change the -no- to a YES by pressing Cal ▲. To complete the re-set press the
SAMPLE
button.
5.
rSEt will appear on the display.
6.
SEt CAL will now appear on the display followed by the normal 0.00 display. Switch the instrument off and then back to
calibrate.
If, after a re-set, you are still experiencing problems then contact ENMET Corporation to arrange a service.