API Audio Accessories 7-22-10 Instruction Manual download pdf (Page 16)

28 (Continued on page 29)

Calibration

Calibration is the process of setting the readings of the instru-

ment to equal the value of certified calibration gases. Prior to

calibration allow the instrument to operate for 5 minutes in a

room environment free of combustible, CO and H2S gases.

Manually zero the instrument prior to beginning the calibration

process.

NOTE: Using calibration kits other than recommended by

SENSIT TECHNOLOGIES may cause inaccurate readings.

Repairs are required if any sensor fails to calibrate. Con-

sult SENSIT TECHNOLOGIES for details.

NOTE: When calibrating, the numbers shown on the dis-

play represent the numbers seen by the microprocessor

and should not be confused with actual gas readings.

These readings will update every 5 seconds during cali-

bration.

Definitions

• AUTO CAL is an automatic calibration process not

requiring a docking station.

• 2.5% V/V is the calibration point for the low end of the

100% volume sensor.

CALIBRATION

CALIBRATION continued from page 28

• 50% LEL indicates calibration of the LEL and PPM

sensors.

• 100 PPM CO indicates the calibration point of the carbon

monoxide sensor.

• 25 PPM H2S indicates the calibration point of the

hydrogen sulfide sensor.

• 10 PPM HCN indicates the calibration point of the

hydrogen cyanide sensor.

• SMART-CAL is the automatic calibration system using IR

communication.

Prior to starting calibration prepare the necessary gases per

the sensor configuration.

From the working display access the menu by pressing and

holding the TICK/MENU BUTTON (B) until the display reads

USER MENU SHOW TIME. Press the SAVE/ZERO BUTTON

Press the TICK/MENU BUTTON (B) to select from the various

calibration modes. The display will now show CAL AUTO CAL.

Pressing the SAVE/ZERO BUTTON (C) will allow viewing of all

other modes of calibration.

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