RKI Instruments GX-94 - Manual (Page 34)

Page 33 GX-94 Operator’s Manual
CALIBRATION MODE
Calibration mode allows you to calibrate the GX-94’s sensor response.
It also includes a menu item which allows you to set the date and time.
Calibrate the GX-94 when you replace a sensor. Also calibrate the GX-
94 periodically to assure proper sensor response. The frequency of cal-
ibration depends upon the amount and type of use. Determine you own
calibration frequency taking your application and requirements into
account. A typical calibration frequency is once per month.
You can set the GX-94 to notify you when it is due for calibration (see
Setting the Calibration Reminder in the setup mode section).
Calibration Supplies and Equipment
To calibrate the GX-94, you will need:
• Known calibrating samples of the gases to be detected. The
combustible and toxic sample concentrations should be
approximately in the middle of the detection ranges; a zero-oxygen
source (such as 100% nitrogen) is recommended for setting the O2
zero.
• A 0.5 LPM (liters per minute) fixed flow regulator
Note
When the RKI fixed flow regulator is screwed onto a gas cyl-
inder, the gas will automatically start to flow at a fixed rate.
Install the fixed flow regulator only during calibration.
• Non-absorbent tubing
• GX-94 calibration adapter
To calibrate all sensors at once automatically without the need for a
zero-oxygen source, you can use the Auto Calibration feature and the
RKI Four Gas Cylinder. This section includes instructions for calibration