Select Calibration Period For No; Troubleshooting; On-Board Diagnostics; 4-20Ma Troubleshooting - Macurco CX-6 Manuel D'instructions

Macurco CX-xx Manual (Rev-1.0) Eng

4.5.18 Select Calibration Period for NO

The value selected for Calibration Period is the number of months. The CX-xx indicates a "calibration due" when it is
within 1 month of the calibration period, and a "calibration overdue" when the detector has reached or exceeded
the calibration period. The Calibration Period setting cannot be changed if the CX-xx is indicating "calibration due" or
"calibration overdue".
Available options are "diS" (default), 3, 6, 12, 24.
To select the Calibration Period for the NO
1. Push the Next button to get to "Con" or the Configuration menu.
2. Push the Enter button to enter the Con menu.
3. Push Next 16 times to get to "CAL.n".
4. Push Enter. The display will show the current setting.
5. Push Next to cycle through the available settings (display will begin flashing).
6. Push Enter to confirm the new setting (display will stop flashing).
7. Push Enter once more to return to the configuration menu.
8. Push Next until "End" is displayed.
9. Push Enter to return to normal operation.

5 Troubleshooting

5.1 On-Board Diagnostics

The CX-xx monitors all critical functions of the unit through software diagnostics that continuously test and verify
unit operations. If a problem is found, the unit will switch to a fail-safe/error mode or trouble condition.
In this error mode, the Alarm relay will be activated, the 4-20 mA current loop will go to 24 mA, the unit will display
the error code, the green status indicator LED light will flash, and the buzzer will chirp intermittently. The Fan relay
will also engage if the Trouble Fan Setting Option is set to "On". This is a safety precaution.
To clear this mode, simply turn off power to the unit for a few seconds or push the ENTER/TEST button (inside the
unit). This will cause the unit to restart the 1-minute self-test cycle.

5.1.1 4-20mA troubleshooting

NOTE: The output from the 4-20ma terminals is steady only when the 4-20mA mode is set to high mode. In dual
mode, fluctuating output will be observed when measured using an ammeter.
0 mA is most likely a connection problem
•
• 1 mA indicates Calibration Overdue (if 4-20mA is configured to 'EnH')
• 4-20 mA is normal gas reading range (0-200 ppm CO, 0-20 ppm NO
• 24 mA indicates a Trouble condition

5.1.2 Trouble Codes

If the detector encounters an error, a trouble code is displayed. The trouble code is displayed as "tXXX" where XXX is
a unique trouble code for each sensor. If a trouble code is larger than 800, it is for CO. If it is smaller than 800, it is
for NO . The following table shows the trouble codes for the CO and NO
2
REV – 1.1
Sensor – "CAL.n"
2
sensor, in normal mode:
2
[34-2900-0512-0 ]
)
2
sensors.
2
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