CM4 Four-Point Continuous Monitor
CM4 Technical Manual
7-4
3 – SET-UP MENU
2 – POINT PARAMETERS
The display reads:
SELECT POINT
3. Use the numeric keys to specify the point you wish to configure,
or press RESET to exit this function.
If the printer output is enabled, the display reads:
PRINT? 1=YES 0=NO
The printout helps to determine which point parameters to change.
If, for example, you selected point 1 (pressed 1) in Step 3, the printer
prints the parameters and the display briefly reads:
POINT 1 SELECTED
The status LED blinks for the point selected
The display changes to:
1=GAS/LEVELS 2=PT ID
4. Press 1 to:
• Select a gas type
• Program the Level 1 and Level 2 alarms
• Set the full scale value of the 20 mA output.
Press 2 to define the point identification. See
.
Upon pressing 1 the display reads:
PT 1 GAS AsH3
5. Press the CURSOR ARROW LEFT/RIGHT to scroll through
the available gases. See
for a list of values.
WARNING
Make sure the gas assignment is correct when entering designations
for specific gases within a gas family (such as Hydrides or Mineral
Acids); the instrument will not show an error prompt for the wrong
gas (e.g., if you select HF rather than HCl). Incorrect gas assignment
or Chemcassette
®
replacement defeats the CM4’s ability to warn of
dangerous gas concentrations.
Be sure you have installed the proper Chemcassette
®
in the analyzer
for the type of gas being measured; the CM4 will not show an error
prompt for installation of an incorrect type of Chemcassette
®
.
6. Press ENTER to select the desired target gas. The following
display will appear briefly:
SET ALARM LEVELS
The display will then read:
L1 = 0050 PPB AsH3
Both Level 1 and Level 2 alarms must be set. The cursor flashes over
the alarm value.
7. Use the numeric keypad to set the Level 1 alarm value (lower
alarm level) for the chosen gas. Press ENTER to accept the
value and advance to the following display:
L2 = 100 PPB AsH3
The cursor flashes over the alarm value.
8. Use the numeric keypad to set the Level 2 alarm value (upper
alarm level) for the chosen gas.
NOTE:
The unit will record any changes if Level 1 is set higher than
Level 2 or if Level 1 and/or Level 2 are set outside the gas
). Re-enter the values until the
parameters are acceptable.
珠海司福斯特科技有限公司
www.safedtech.com