AQ EXPERT Instruction & Operations Manual
Version 1.13
Page 30 of 63
ZERO ERRORS
: This will display a list of sensors that were
out of the monitor’s
acceptable range during the last zero countdown.
ZERO TIME
: This is the countdown time for the zero procedure. The zero cycle time
should set at 20-60 seconds.
SPAN TIME
: When carrying out a span calibration, you must introduce the span gas for
an appropriate amount of time before the monitor executes the span calibration. This
setting, which is the same for all sensors, controls this time interval. The span time is
indicated in seconds.
SPAN LOCKOUT
: This controls access to the remaining span calibration menu
options. Span lockout prevents accidental or mistaken calibrations. Span lockout is
enabled and disabled by entering a 4-digit code.
SENSOR HISTORY
: The date that each sensor was installed is displayed, along with
the date the sensor was last calibrated and the span gas concentration used.
SPAN XXXX
: The remaining lines of the CALIBRATION MENU are used for carrying
out span calibrations of the CO, CO
2
, NO, NO
2
, SO
2
, H
2
S, Ozone, Formaldehyde,
VOCs, and Velocity sensors. For detailed use of these settings, please refer below.
A. ZEROING THE AQ EXPERT
Select
CALIB
key to go into Calibration Mode
There are two (2) methods to Field-Calibrate the GAS & CO
2
Sensors on the AQ Expert.
(i) ZERO Gas Sensors using the
ZERO AIR CYLINDER
and Moisture Exchange
Tube (AQ MET) (to zero ALL gas sensors)
(ii) Using the AQ CAL-ZF Filter to ZERO the VOC gas sensor in
AMBIENT AIR
(except the CO
2
sensor)
1. ZEROing ALL GAS Sensors using a certified CYLINDER of ZERO AIR
If you have a gas cylinder/bottle of ZERO AIR, you can use this for Zeroing ALL of the
gas sensors in the AQ Expert. If you do not have this cylinder, please contact
E Instruments to purchase our optional Calibration Kit consisting of ZERO AIR &
regulator for proper calibration of the AQ Expert (part #: AQCAL).
ZERO GAS SENSORS
: This will set the zero point of CO, NO, CH
2
O, NO
2
, SO
2
, H
2
S,
O
2
, and VOCs values. Connect Cylinder to the
“A” inlet connection on the bottom of the
AQ Expert using the optional accessories included in the CALIBATION KIT (Part #:
AQCAL). See CALIBRATION APPARATUS section below for how to connect. For
Best Results, use the AQ MET
– Moisture Exchange Tube accessory for ZERO Air
