GE Hydran 201i Installation Manual page 15

2. Do not remove the protective plastic caps from the sensor and/or the brass
adaptor's threaded extremity until ready to install on the transformer valve.
These caps protect the adaptor threads (see Figure 5 above) and the sensor
membrane from debris and sharp objects. If the sensor is dismounted, place
immediately the supplied cap onto the sensor's threads.
CAUTION
3. Do not touch the H201 sensor's membrane (located inside the threaded
extremity) with a finger or an object (see Figure 6 below). The membrane is
easily damaged; this would impair the sensor permanently, thus voiding the
warranty.
Page 16
Figure 5: H201Ti's Serial Number and Protective Cap
Mishandling of the Hydran 201 sensor (such as a perforation or
scratch on the membrane or subjecting the sensor to paint or
solvent) voids the warranty.
Hydran* 201i Installation Guide
17996 Rev5, August 2013