Hach-Lange ORBISPHERE Model 51x User Manual - Manual (Page 42)

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Installation
3.10 Sensor installation
3.10.1 EC Sensors
For EC sensor installation, servicing, and maintenance ensure you follow the instructions in the
Sensor Installation and Maintenance
manual that was supplied with the instrument.
3.10.2 TC Sensors
For TC sensor installation, servicing and maintenance ensure you follow the instructions in the
TC Sensor Installation and Maintenance
manual that was supplied with the instrument. Pay
particular attention to the installation and connection of the purge gas supply.
To ensure the continuation of purge gas while the sensor is in contact with the sample, it is
highly recommended to use a backup purge gas cylinder with an automatic changeover valve
that activates when the first cylinder is empty.
The use of an ORBISPHERE Model 29089 gas regulator (or similar) is also recommended to
deliver a constant, pressure regulated supply of dry purge gas to the sensor, filtered to 40 µm.
In addition, and to prevent any damage to the sensor electronics, the use of a purge safety
backup unit (ORBISPHERE Model 32605) is highly recommended to ensure the supply of purge
gas remains uninterrupted to the sensor in the event of a mains power outage.
The above ORBISPHERE accessories are explained in more detail in the TC Sensor
Installation and Maintenance
manual.
NOTICE
Do not place the TC sensor into a liquid sample until a constant supply of dry purge gas has
been connected, as liquid could condense inside the measuring chamber and cause damage
to the thermal conductor chip.