ENMET PPM Formaldemeter™ htV-m - Manual (Page 6)

Formaldemeter
htV-m
ENMET Corporation
4
3.3 Using the Formaldemeter™
htV-m
The Formaldemeter ™
htV-m
, is set to function as a handheld.
3.3.1 Taking a Sample
Power On
Press the POWER button once. The display will show
- - - -
Followed by:
0.00
This indicates that the instrument is ready to take a sample.
Power Off
Switch the instrument off by pressing and holding down the ON-OFF button for 3 seconds until display shows
OFF
Then release. A click is heard, your instrument is now off.
Sampling
Turn instrument on; hold the instrument in the atmosphere to be sampled. Press and release the SAMPLE button.
The display will show
run
The internal pump should be heard running for a short period as it samples the air.
The display will next flash between the following two screens for 10 seconds
-. - - and 0.00
The display will then show
-. - - flashing, as the sample is analyzed. After 60 seconds, the display will show a non-flashing
value, which is held until the instrument is switched off. This indicates the formaldehyde concentration in parts per million
(ppm).
By holding down the
button the instrument will show the reading in mg/m
3
alternating with the following screen:
Alt=
By holding down the button, the display will show the time taken to reach the displayed concentration in seconds. In the
event that high levels of an interferent is present, the instrument will give a reading in around 10 seconds, to avoid the sample
being affected by the interference.
Alternative Settings
The two durations listed above (10 and 60 seconds), may vary depending on the specifications of the supplier or customer.
These values are the default set by the instruments manufacturer. For further details please contact your local distributor.
3.3.2 Sensor Recovery Period
Between samples, the instrument should be left switched off for a few minutes to allow the sensor to clear of any residual
formaldehyde. As a general rule, the higher the reading obtained, the longer it takes for the sensor to clear.
If the instrument is switched on before the sensor has cleared, the pump will not operate and the display will flash:
- - - -
The cell is clear only when the following display is shown for three seconds without interruption:
0.00
The instrument is now ready to take the next sample.
If the instrument does not clear after approximately 5 minutes, then refer to troubleshooting section of the manual.
3.3.3 Memory Full
Since the
htV-m
has a built in memory system, every sample taken either manually or continuously will be recorded, eventually
after many samples (minimum 2000) have been taken the memory will become full and the display will show:
FULL
This means further samples cannot be taken since the memory is full. The display will continue to show:
FULL, until the
memory is downloaded and cleared or the over write option is selected.
The memory is cleared using the download software included in your
htV-m
kit.
Option – Alternatively it is possible to set to over write the oldest sample in the memory with the latest. (See section 5.4 Stop
on Full Mode or use the download software to change the settings).