Part 2 Installation
2.3
Mounting the Electronics Module and Sensor Housing
H3 Sensor Housing Dimensions
A precision electrochemical oxygen sensor is included as a separate item and must be installed prior to
instrument use.
CAUTION: Do not open the N2 filled oxygen sensor bag until you have thoroughly read the instruc-
tion manual and have made all gas and electrical connections. Please refer to section 2.6 or 2.7 to
reference installing the oxygen sensor into the sensor housing as well as section 4.1 and 4.2 on SPAN
Calibration.
When installing the H3 sensor housing, it is important to make sure the bottom portion of the sensor
housing is mounted flat and the top portion of the sensor housing which is manufactured of nylon is
at the top. This will insure that the sensor is always face down (Screen side down, Circuit Board facing
up). This will allow any air bubbles to rise to the top and not interfer from the sensing membrane.
Oxygen Sensor Front and Rear View
The sensor housing has 4 wires and should be hard wired into the
back of the OMD-501D electronics module as follows:
Sensor (+) red wire = Pin 5
Sensor (-) black wire = Pin 6
ATC (+) white wire = Pin 7
ATC (-) Green wire = Pin 8
The sensor housing comes with a 6 foot ca-
ble. Longer cable should NOT be spliced in
as the signal can degrade and cause erronous
readings.
