TXP-C20_Instruction_Manual_(Rev1.0)
REV – 1.0
[34-2900-0207-5 ]
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P a g e
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Do not use a gas cylinder beyond its expiration date.
•
Calibrate a new sensor before use.
•
Allow the sensor to stabilize before starting calibration (approximately 5 minutes).
•
Calibrate on a regular schedule. (Macurco Gas Detection recommends once every 3 months, depending on
use and sensor exposure to poisons and contaminants.)
•
Calibrate only in a verified clean atmosphere free of background gas or using appropriate zero gas.
Use the following step-by-step procedure to perform ZERO and SPAN calibrations.
1.
To enter the CAL MODE from any data display, press the dual-purpose DOWN / CAL key and within 5
seconds press the EDIT key.
2.
Using the Cal-Cup and following the instructions on the screen, apply a clean ZERO gas or be sure there is no
background target gas in the monitored area. After the reading is stable, (approximately 1 minute) press the
EDIT key to perform a ZERO calibration.
3.
If the ZERO calibration is successful, CAL MODE automatically proceeds to the SPAN check.
4.
Apply the correct SPAN gas at .5 liters/min. After the reading is stable, (approximately 1 minute) press the
EDIT key to perform a SPAN calibration.
WARNING: The SPAN gas used must match the value specified since this is what the TXP-C20 will indicate after a
successful SPAN calibration. The Span Gas value may be edited if it becomes necessary to apply a different gas
concentration (see Span Gas in section 2.2.5).
5.
If the SPAN calibration is successful, the display flashes “REMOVE CAL GAS” and starts the CAL PURGE delay.
6.
CAL MODE will be complete after the end of the CAL PURGE delay.
The flow chart in Figure 4-7 illustrates the above procedure. UP, CAL, NEXT & EDIT labels indicate keystrokes
(CAL/DOWN is a dual-purpose key). The CAL MODE information screen (top of the chart) is available for advanced
users to see Offset / Gain calibration constants and live analog to digital converter (A/D) counts. Span Gas
calibration values may also be edited from this screen. Holding the UP key, for 5 seconds during CAL MODE,
displays this screen.
Figure 3-7 – Cal Menu Tree
3.4
System Configuration Menus
Several items needing configuration are not specific to either channel but affect the entire TXP-C20 system. These
are located in the system tree entry menu shown on the left side of Figure 3-1. System menus are accessed by
