Operator's Manual

16 | P a g e

Two instruments can be linked as per the above procedure. One instrument can be lowered into the

manhole by means of a lanyard attachment or extended into a confined space by means of an

extension rod attachment (sold separately, please consult with your accredited distribution agent).

The other instrument can be held by the person that must enter the manhole and/or confined space.

The person can then view the remote gas readings in the manhole and/or confined space and verify

that it is safe to enter. This will eliminate gas exposure risks associated with the person first entering

the manhole and/or confined space in order to take the relevant measurements.

The slave instrument can also be placed in a confined area so that early warning of dangerous

conditions can be read by the user at regular intervals.

1.6 Over- Range

As there are limits to the range of each sensor fitted, the software will monitor the range measured and

switch the instrument automatically into a latched alarm. The user must acknowledge the latched alarm

by pressing the UP and DWN keys at the same time.

The OVER-RANGE alarm will be indicated by that particular sensor’s flashing maximum reading.

1.7 Auto Calibration

The instrument has the capability to be automatically calibrated. An auto calibrator is required to

facilitate this feature. The auto calibrator is pre-programmed with the gas types and concentrations

connected to the auto calibrator. The user only has to place the instrument into the auto calibrator, the

instrument will match its sensors fitted to the gas types of the auto calibrator and initiate the calibration

process.

Figure 11: Auto Calibrate screen

1.8 Programmable options

DISPLAY_10_PPM_1 This option will allow the ExSens X4 Instrument to display or block-off the

lower 10ppm of the measured gas value for toxic sensor 1. If blocked off, it

allows for a smoother display if the sensor has a constant moving baseline.

(Default = DISABLED).