Table of Contents
Advertisement
To access this information, scroll down to the desired sensor choice and using the
ARROW DOWN button and press the MENU button. Once the information has been
viewed, press the MENU button to return to the previous menu.
5.6. USB Menu
This menu item allows the user to reset the USB chip if any problems are
experienced while trying to communicate with the IQ Chek software. After selecting
RESET from this menu, the user will receive the message USB HAS BEEN RESET.
NOTE: If you remove the USB cable before shutting down the IQ Chek program, the
IEQ Chek may continue to display PC Mode. Press and hold the MENU button to
clear this and return to normal measurement mode.
6.
CALIBRATION
6.1. Overview
This section details the calibration procedure and is an extension of the Calibrate
Menu section from page 12.
NOTE: Calibration should always be performed by a trained and experienced
technician. Temperature and Relative Humidity sensors must be calibrated using a
special chamber and therefore field calibration is not permitted. Only gas sensors can
be field calibrated.
6.2. Requirements and Cautions
1)
Always ensure batteries are fully charged (if rechargeable batteries are installed)
or fresh alkaline batteries are installed. This is especially important when
calibrating sensors having a higher current demand (such as infrared,
combustible, and PID).
2)
Allow a twenty (20) minute warm up period before attempting calibration of any
gas sensors. This allows all sensors time to fully warm up and stabilize and
produces the most accurate results for calibration.
3)
Always perform both zero (null) and span functions on all sensors. Zero function
involves flowing 100% nitrogen into the inlet port of the instrument.
4)
Cylinders of nitrogen and appropriate span gases are required for calibration.
NOTE: Ensure the cylinder regulator is an "on demand" draw or that there is a
reservoir of target gas available from which to draw the calibration sample.
The pump inside the IEQ Chek must not be "drawn down" because of a low flow
rate from a cylinder regulator. Conversely, the pump must not be "back driven" by a
high flow rate being forced through the instrument. The result will be inaccurate
calibration values. Span gas values should preferably be approximately 40% to 60%
of the installed sensor measurement ranges. Always remove cylinder regulators from
air and gas cylinders before storing.
Calibration can be achieved from the instrument keypad menu. The following
procedure deals with the calibration procedure through the instrument keypad menu.
1509-9001 Rev 1
IEQ Chek
Operation Manual
19
Advertisement
Table of Contents
