50
COMMISSIONING
6.6.
6.6.
6.
CC
CC
C
OMMISSIONINGOMMISSIONING
OMMISSIONINGOMMISSIONING
OMMISSIONING
6.1 Why a Transmitter Must be Rezeroed .................................................................................... 50
6.2 Utilizing the Zero and Span Push-Buttons .............................................................................. 51
6.2.1 Installation Flow Chart Using Push-Buttons ............................................................................ 52
6.2.2 Procedure ............................................................................................................................ 53
6.3 Utilizing the HART Communications ....................................................................................... 53
6.3.1 Installation Flowchart Using HART Communicator ................................................................... 53
6.3.2 Connecting the HART Handheld Communicator ...................................................................... 55
6.3.3 Procedure ............................................................................................................................ 56
6.4 SPX Analog Output ............................................................................................................... 57
6.5 Alarm & Saturation Values for Transmitters Set to Burst Mode ................................................. 58
6.6 Alarm & Saturation Values for Transmitters Set to Multidrop Mode .......................................... 58
6.7 SPX Transmitter Functions via HART (with Fast Key Sequences) ............................................... 58
6.8 Reranging via HART ............................................................................................................. 60
6.9 Resetting to Factory Default Settings ................................................................................... 62
6.10 Definition of “Restore Factory Defaults” ............................................................................... 62
6.11 HART Communicator Fast Key Sequences ............................................................................. 63
There are two ways of commissioning the SPX transmitters. This can be done by utilizing the ZERO and
SPAN Push-buttons, or by HART Communications via a communicator connected to the pressure loop.
If the SPX is equipped with the optional HART communications, it is not necessary to access the push
buttons on the sensor.
If the transmitter is not equipped with HART then the push buttons must be utilized. However, Sections
6.3 through 6.8 and 6.11 may be skipped.
6.16.1
6.16.1
6.1
WW
WW
W
HYHY
HYHY
HY
AA
AA
A
T T
T T
T
RANSMITTERRANSMITTER
RANSMITTERRANSMITTER
RANSMITTER
MUSTMUST
MUSTMUST
MUST
BEBE
BEBE
BE
REZEROEDREZEROED
REZEROEDREZEROED
REZEROED
The transmitter output must be nulled at zero pressure after installation when the machine has stablized
at operating temperature. This is easy to understand why when considering the mechanical properties of
the sensor.
As described in section 1.5, a fill fluid transmits the process pressure from the sensor tip of the
transmitter (at process temperature) to the electronics housing (at ambient temperature). As the
transmitter sensing tip is brought from ambient to process temperature, the fill fluid expands and
increases the amount of deflection on the sensing diaphragm. This creates a positive pressure reading,
as if a small pressure was actually applied, even with zero pressure on the system.
Also, depending on the orientation of the sensor, the wieght of the fluid will have an effect on the
sensing diaphragm. The weight of the fluid will either increase the deflection of the diaphragm as if a
small pressure is applied or may pull on the diaphragm as if pressure was pulling away from the sensor (a
negative reading).
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