Y18SENS03 Dewpoint sensor mounting instructions

Y18SENS03 Dewpoint sensor mounting instructions

Mounting instructions

The Y18SENS03 Transmitter can be mounted either into a flow-through sensor sampling block (optional) or directly into a pipe or duct. When installed, fully tighten using a wrench until the seal is fully compressed and to the following torque settings: G 1/2” BSP 56 Nm (41.3 ft-lbs).

To mount the transmitter into the sensor block (preferred method), proceed as follows
Under no circumstances should the sensor guard be handled with the fingers.
  1. Remove the protective cover (2) and the desiccant capsule (2a) from the tip of the transmitter (1).
  2. Check that the seal is fitted behind the threaded part of the transmitter body.
  3. Screw the transmitter (1) into the sample block (3) and tighten to the recommended torque setting. NOTE: Use the flats of the hexagonal nut and not the sensor body.
  4. Fit the transmitter cable assembly to the connector at the base of the transmitter and tighten.


The transmitter may be directly mounted into a pipe or duct.
Do not mount the transmitter too close to the bottom of a bend where any condensate in the pipeline might collect and saturate the probe.
The pipe or duct will require a thread to match the transmitter body thread. For circular pipework, to ensure the integrity of a gas tight seal, a mounting flange will be required on the pipework in order to provide a flat surface to seal against.
  1. Ensure that the protective cover and the desiccant capsule have been removed from the tip of the transmitter (3).
  2. Check that the seal is fitted behind the threaded part of the transmitter body.
  3. Screw the transmitter (3) into the pipe. Tighten enough to obtain a gas tight seal. (Torque will depend upon the pipeline material.) NOTE: Do not overtighten or the thread on the pipework may be stripped.

 
Be Sure the Sample is Representative of the Gas Under Test: The sample point should be as close to the critical measurement point as possible. Also, never sample from the bottom of a pipe as entrained liquids may be drawn into the sensing element.
 
Minimize Dead Space in Sample Lines: Dead space causes moisture entrapment points, increased system response times and measurement errors, as a result of the trapped moisture being released into the passing sample gas and causing an increase in partial vapor pressure.

Remove Any Particulate Matter or Oil from the Gas Sample: Particulate matter at high velocity can damage the sensing element and similarly, at low velocity, they may ‘blind’ the sensing element and reduce its response speed. If particulate, such as degraded desiccant, pipe scale or rust is present in the sample gas, use an in-line filter, as a minimum level of protection. 

Position Transmitter away from Heat Source: It is recommended, as good instrumentation practice, that the transmitter is placed away from any heat source to avoid adsorption/desorption.