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GTD-3000ExW

Instruction Manual

7.2. Calibration Mode

7.2.1. Zero Calibration

PASSWORD

[**]

- Contacting "FUNC" key with the Magnet-bar for 2 sec or longer in Measuring Mode enters Password mode.
- After setting Password using "↑" or "↓" key, contact "FUNC" key.

CALIBRATION

MODE

- Contact "↑" or "↓" key to select "Calibration Mode".
- Contact "FUNC" key when "CALIBRATION MODE" is displayed to enter Calibration Mode.
- Contact "RESET" key to return to Measuring Mode.

CALIBRATION

[ZERO]

- When "CALIBRATION MODE" is displayed, contacting "FUNC" key selects Zero Calibration.
- Contact "↑" or "↓" key to achieve [ZERO] then contact "FUNC" key to enter Zero Calibration.

ZERO CALIBRATION

[YES]

- Contact "↑" or "↓" key to achieve [YES] then contact "FUNC" key to perform Zero Calibration.

ZERO GAS

[ 0]

- Using a calibration tool, inject clean air or 100% nitrogen into the sensor at a flow rate of 500 mL/min for

1 min. Contact "FUNC" key when measurement is stabilized to automatically perform Zero Calibration.

ZERO PROCESSING

SUCCESS >>>>

- When zero calibration is successful, "ZERO SUCCESS" is displayed for 2 sec on LCD display then it

changes to "CALIBRATION DATA" Mode.

- When zero calibration is not successful, "ZERO FAIL" is displayed for 2 sec and it changes to

"CALIBRATION DATA" Mode.

- ZERO FAIL occurs when sensor input value exceeds 70% of total ADC input range.

ZERO PROCESSING

FAIL >>>>

CALIBRATION DATA

[ 0]

- It is a mode to display measurement after calibration and checks whether calibration is successful

after performing auto calibration.

- When it failed, it displays "FAIL" and the current measurement in 1 sec interval.
- Contact "RESET" key to return to "Calibration mode".

■ Due to characteristics of the gas detector, minimum 30 min of stabilization time is required and maintenance

condition may change depending on site condition.

7. System Mode

7.2.2. Span Calibration

CALIBRATION

MODE

- Contact "↑" or "↓" key to select "Calibration Mode".
- Contact "FUNC" key when "CALIBRATION MODE" is displayed to enter Calibration Mode.
- Contact "RESET" key to return to Measuring Mode.

CALIBRATION

[SPAN]

- Contact "↑" or "↓" key to achieve [SPAN] then contact “FUNC" key to enter Span Calibration mode.

SPAN CALIBRATION

[YES]

- Contact "↑" or "↓" key to achieve [YES] then contact "FUNC" key to perform Span Calibration.

SPAN GAS VALUE

[ O ]

- Using a calibration tool, inject the standard gas to the sensor at a flow rate of 500 mL/min for 90 sec.

After the measurement is stabilized, contact "FUNC" key to enter the next mode.

- When Hold function in Maintenance Mode is on, the current maximum SPAN gas value is held and

displayed in the first row.

- The current measurement is displayed in the second row.

[ 0]

< O ]

SPAN SET VALUE

[ 5O ]

- It is a mode to set standard gas value. When there is no "Fail" message, contact "↑" or "↓" key to set a value.
- When the inject standard gas value is abnormal, it displays Fail message. Fail message is as follows.

Fail message and span set value are displayed alternatively.

① "LOW FAIL" occurs when the difference between injected gas value and zero calibration value is below 1%.

② "HIGH FAIL" occurs when injected gas value is above 95% of total ADC input range.

"RING FAIL" occurs when injected gas value runs in the current set span value, it exceeds 95% of ADC

input range. The above FAIL messages are automatically released if the status is normal after adjusting

SPAN value.

CALIBRATION DATA

CAL HIGH ERROR

SPAN PROCESSING

SUCCESS >>>>

- After completing the standard gas value setting, contacting "FUNC" key automatically runs Span

Calibration. When it succeeds, "SPAN PROCESSING SUCCESS" is displayed on LCD display for 2 sec