8013362/1DQY/2021/10/12
© SICK AG • Germany • All rights reserved
25
Operating
Instructions
PHT
3. Signs, symbols and abbreviations / 4. Function
4. Function
The pressure prevailing within the application is transformed into a standardized electrical signal
through the deflection of the diaphragm, which acts on the sensor element with the power supply
fed to the transmitter. This electric signal changes in proportion to the pressure and can be evalu-
ated correspondingly.
5. For your safety
5. For your safety
Select the appropriate pressure transmitter with regard to scale range, perfor-
mance and specific measurement conditions prior to installing and starting the
instrument.
Observe the relevant national regulations (e.g.: EN 50178) and observe the
applicable standards and directives for special applications (e.g. with
dangerous media such as acetylene, flammable gases or liquids and toxic gases
or liquids and with refrigeration plants or compressors). If you do not observe the
appropriate regulations, serious injuries and/or damage can occur!
Open pressure connections only after the system is without pressure!
Please make sure that the pressure transmitter is only used within the overload threshold limit
all the time!
Observe the ambient and working conditions outlined in section 7 “Technical data”.
Observe the technical data for the use of the pressure transmitter in connection with aggressive
/ corrosive media and for the avoidance of mechanical hazards.
Ensure that the pressure transmitter is only operated in accordance with the provisions i.e. as
described in the following instructions.
Do not interfere with or change the pressure transmitter in any other way than described in
these operating instructions.
Remove the pressure transmitter from service and mark it to prevent it from being used again
accidentally, if it becomes damaged or unsafe for operation
Take precautions with regard to remaining media at removed pressure transmitter. Remaining
media at the device may be hazardous or toxic!
Have repairs performed by the manufacturer only.
Open circuit before removing connector / cover.
It is necessary that before starting the pressure transmitter you check the diaphragm visually,
as this is a safety-relevant component (Please refer to section 7 below).
Warning
