Calibration and Adjustment - GMP251

GMP251 User Guide

Document code
M211799EN
Revision
G
Language
English (United States)
Product
GMP251
Document type
User guide
CAUTION Before using the calibration and adjustment commands, read through Calibration and Adjustment. Make sure that the environmental compensation settings of the probe are properly set for your calibration environment; see Environmental Compensation.
Table 1. Adate Command
Syntax Description
adate<cr> Show CO2 factory adjustment date.
Example:
adate
Adjustment date : 20150420
Table 2. Atext Command
Syntax Description
atext<cr> Show CO2 factory adjustment information.
Example:
atext
Adjusted at Vaisala/Helsinki
Table 3. Cdate Command
Syntax Description
cdate<cr> Show calibration date.
cdate [yyyymmdd]<cr> Set a new calibration date.

yyyymmdd = Year (yyyy), month (mm) and day (dd) of calibration

Example:
pass 1300
cdate
Calibration date : 20150220
Example (set a new calibration date to June 30, 2015):
cdate 20150630
Calibration date : 20150630
Table 4. Ctext Command
Syntax Description
ctext<cr> Show calibration information text.
ctext [text]<cr> Set a new calibration information text to be shown after the automatic text "Calibrated at".
Example:
pass 1300
ctext
Calibrated at 5.0% in lab
Example (set a new information text):
ctext 0% 5% by NN
Calibrated at 0% 5% by NN
Table 5. CCO2 Command
Syntax Description
cco2<cr> Show current user adjustment status.
cco2 -lo [co2]<cr>

cco2 -hi [co2]<cr>

Perform a 1-point (only either low or high concentration) or 2-point (both low and high concentrations) calibration and adjustment.

-lo = Adjustment at low concentration (under 2 %CO2)

-hi = Adjustment at high concentration (over 2 %CO2)

co2 = CO2 concentration reference in ppm

cco2 -save<cr> Save the currently entered adjustments.

Successfully saving the adjustment clears the calibration date (cdate command) and calibration text (ctext command) that have been stored in the probe. Use those commands to enter a new calibration date and text.

cco2 -cancel<cr> Cancel currently entered adjustments.
cco2 -reset<cr> Clear user adjustments.
Example (show current user adjustment status; no adjustment done):
pass 1300
cco2
1.Ref. point low 0
1.Meas. point low 0
2.Ref. point high 200000
2.Meas. point high 200000
Gain : 1.0000
Offset : 0.0000
Example (perform a 1-point calibration):
  1. Let the probe stabilize in the desired CO2 concentration (here: 5 %CO2 (=50000 ppm)).
  2. Enter the calibration commands:
    pass 1300
    cco2 -hi 50000
    OK
    cco2 -save
    OK
  3. Enter a new calibration date and information text:
    cdate 20150630
    Calibration date : 20150630
    ctext 5% in lab
    Calibrated at 5% in lab
Example (perform 2-point calibration):
  1. Let the probe stabilize in the desired low CO2 concentration (here: 0 %CO2).
  2. Enter the calibration commands:
    pass 1300
    cco2 -lo 0
    OK
    cco2 -save
    OK
  3. Let the probe stabilize in the desired high CO2 concentration (here: 5 %CO2 (=50000 ppm)).
  4. Enter the calibration commands:
    pass 1300
    cco2 -hi 50000
    OK
    cco2 -save
    OK
  5. Enter a new calibration date and information text:
    pass 1300
    cdate 20150430
    Calibration date : 20150430
    ctext 0% 5% by NN
    Calibrated at 0% 5% by NN