InWater Tracker
User Manual
–
2021
13
1.250.850.0022 | [email protected] | INWATERTECH.COM
3.2.
Continuous Use
In some applications the TGP probe is left continuously
submerged in water. Under such circumstances, eventually
water condenses as small droplets on the internal walls of the
tubing. As these droplets grow in size, they will eventually
coalesce resulting
in “cross
-
bridging”. The pressure detected by
the sensor will produce a difficult-to-define average of the
actual TGP. Cross-bridging can lead to excess water
accumulation inside the tubing.
Excess water in the tubing can damage the pressure transducer
if actual contact is made with the pressure sensitive wafer.
The time taken for such a condition to arise is inversely
proportional to water temperature. i.e: the higher the water temperature, the faster the bridging will
occur.
In summary, the frequency of probe maintenance is site and condition specific.
AS A GUIDELINE, THE PROBE SHOULD BE REMOVED FROM THE WATER ON A ROUTINE BASIS EVERY
THREE WEEKS FOR CLEANING. (based on water temp of 15Deg C)
3.3.
Check for damaged or broken membrane tube
If the membrane tube is compromised in any way, TGP readings will be wrong. A simple way to check
the integrity of the tubing is to observe the TGP readings as the probe is steadily immersed in water. A
fast increase (several mmHg per second) in displayed values indicates a damaged or broken membrane
tube. Replace the cartridge and recalibrate. The recommended method to check for a faulty membrane
cartridge is to use the syringe test as shown on the following page.
•
Inspect the tubing for any visible signs of damage. If damaged or broken, replace the
cartridge. Otherwise leave the probe in air until there is no sign of water present in the
tubing.
•
Re-calibrate if necessary.
Note: A need for an unusual degree of calibration correction could mean that the pressure sensor has
been damaged by the bulk water
3.4.
Changing the Membrane Cartridge
Occasion may arise where the membrane tubing becomes damaged resulting in erroneous readings.
This is typically displayed as a sharp increase in TGP when the probe is in water with values that remain
