41
087-0020 REV
E
System Maintenance
General
For maximum safety, perform a sensor response test weekly; see “Making Operational
Check Gases” in this section.
The only other maintenance requirements are that the unit be zeroed and calibrated at
regular intervals. The user must establish these intervals based on the requirements of
the application; however, the
minimal recommended intervals are as follows:
Zero adjustment – Every 60 days
Span adjustment – Every 90 days
Sensor Maintenance
These gas sensors are maintenance free. There are no filling solutions or membrane
replacements required. The only service that can be done on a sensor is the cleaning of
the protective membrane on the tip of the sensor. If this membrane becomes
excessively dirty, the sensor will respond sluggishly, or not at all.
To clean the membrane, use distilled water and a
Q-Tip to gently remove dirt buildup. Be careful not
to puncture the membrane during cleaning and
DO
NOT USE DETERGENTS OR SOLVENTS OF
ANY KIND.
Sensor Replacement
GasPlus sensors are “pop-in” designed, for ease of
replacement. Spare sensors are
supplied in sealed containers and should not be
opened until installation is required. When installing
a new Sensor, avoid touching or pressing the white
membrane on the front of the sensor. Excessive dirt
or grease on this membrane will cause a slow
response, and puncturing the membrane will
destroy the sensor. The sensor manufacture date
code is found in the serial number. For example S/N
0102-0025 was manufactured in January (01) of 2002 (02).
Elastomeric Connector
Under normal conditions, this will not need to be replaced for three to four years. However, if for
any reason the pad should become “tacky”, “soft”, ripped or show any wires starting to protrude
then the pad should be replaced.
To do this, gently wedge the old one out with a small screwdriver and press a new one in,
ensuring it is sitting flat on the connecting PC board and that the alignment pin is fitted in the pad
hole. The pad can be installed with any side up.
Making Operational Check Gases
Figure 19 E-Pad &
Sensor
Freedom 5000 Universal Analog Toxic Gas Detector
Instruction Manual