CM4 Four-Point Continuous Monitor
CM4 Technical Manual
5-4
WARNING
Use appropriate safety precautions when handling toxic gases.
Properly vent toxic gases.
NOTE:
K-factors should be 1.000 unless actual gas calibration
procedures are performed.
Instructions
1. Press PROGRAM to exit Monitor Mode.
2. From the 1–CALIBRATION MODE, choose the subfunction
2–MANUAL K-FACTOR.
1 – CALIBRATION MODE
2 – MANUAL K-FACTOR
The display now shows:
SELECT POINT
3. Use the numeric keys to specify the point. The display shows
the current K-factor:
PT 1 K-FACTOR = 1000
4. U s e t h e n u m e r i c k e y s t o e n t e r t h e n e w
K-factor.
5. Press either:
• ENTER to save the new entry and return to the Calibration
Mode
or
• RESET to return to the Calibration Mode without changing
any data
Repeat Steps 1 through 5 to adjust the calculated concentration for
each point, if required.
K-factor range limits are 0.200 to 5.000. Using a value outside of
these limits displays the following, after which the CM4 returns to the
previous display:
OUT OF LIMITS
PT 1 K-FACTOR = 1000
5.4 Function 1.3 – Calibrate Current Loop
Purpose
The Calibrate Current Loop function calibrates the external analog
devices connected to the module by generating a 2 mA to 20 mA
analog signal from each individual point. If 2 mA fault indication is
disabled via menu function 3.3.5, then the minimum current will change
from 2 mA to 4 mA. This function provides three methods to calibrate
connected devices:
• Toggling between 2 mA, 4 mA, and 20 mA signal levels
• Automatically changing output signal levels beginning at 2 mA
and going up to 20 mA
• Step up the current loop from 4 mA to 20 mA in 1 mA
increments.
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