Alpha Moisture Systems DS1200-AMT Manual de instalación, puesta en marcha y funcionamiento - Página 12
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9.2
Entering Autocal Mode
•
Once the transmitter has been pre-conditioned, the AutoCal Mode of the AMT can be activated. Press
and hold the 'W' and 'D' buttons, simultaneously for 5 seconds. ONLY PRESS THE BUTTONS IF
THE SENSOR IS PROPERLY PRE-CONDITIONED. FAILURE TO COMPLY WILL
CORRUPT THE TRANSMITTERS CALIBRATION.
•
The attached 4-20mA display will (after the 5 seconds) indicate the bottom range of the AMT (or
4mA if reading current) for 5 seconds, confirming that autocal mode has been entered. The buttons
should be released once the display indicates the bottom range.
•
After the 5 seconds delay the AMT will revert to the measured dewpoint and the buttons will be
active.
9.3
Adjust the autocal
•
Use the 'W' and 'D' buttons to move the reading up or down so that the desired dewpoint is
displayed.
Method 1: - Adjust the AMT reading until the indicator reads the known moisture level.
Method 2: - Adjust the AMT reading until the indicator reads 0°C or –20ºC whichever is applicable
to the AMT being AutoCaled
Method 3:- Adjust the AMT reading until the indicator reads the known ambient moisture reading.
9.4
Completing the autocal
•
Once the desired value is reached, the autocal process can be completed simply by leaving the buttons
untouched for 30 seconds. After the 30 seconds, the display will indicate the bottom of the range for a
period of 5 seconds and then the AMT will exit the autocal mode.
•
The AMT will now output the corrected dewpoint and can be reinserted into the process.
•
A graphical description of the autocal modes is given on the next page.
9.5
AMT Range AutoCal Method Lookup Table
Use the table below to decide which AutoCal methods are appropriate for your AMT.
-80 to –20ºC
-110 to –20ºC
-120 to –20ºC
-65 to 0ºC
-80 to 0ºC
-100 to 0ºC
-65 to 20ºC
-100 to 20ºC
-120 to 20ºC
1-1000ppm(v)
1-1000ppb(v)
0.01-10g/m3
0.1-10lb/MMSCF 0.1-25lb/MMSCF 0.1-50lb/MMSCF
Range
-112ºF to –4ºF
-166ºF to –4ºF
-184ºF to –4ºF
-85ºF to 32ºF
-112ºF to 32ºF
-148ºF to 32ºF
-85ºF to 68ºF
-148ºF to 68ºF
-184ºF to 68ºF
0.1-100ppm(v)
0.01-10ppm(v)
0.001to1g/m3
Page 9
Methods Appropriate
1 & 2
1 & 2
1 & 2
1 & 2
1 & 2
1 & 2
1 & 3
1 & 3
1 & 3
1
1
1
1