P/N: 974153 |
Rev: 072016
|
ECO: 46503
www.dynisco.com
From lab to production,
providing a window into the process
-25-
The available pressure is now adopted as the new lower range value.
Steps past this point are not part of a normal bench setup and should only be performed by qualified
individuals, as the SPX is highly stable and has been factory calibrated with highly accurate pressure
generators. This function should only be performed on such equipment.
5.
Apply Full Scale pressure and verify output is 20 mA. If output is other than 20 mA, perform
Local Span adjustment:
i.
Do not remove seal screw when the circuit is live in a hazardous area.
ii.
Remove span pushbutton seal screw.
iii.
Using a 2mm or smaller Allen key, depress the pushbutton for a ½ second.
iv.
Release pushbutton for a ½ second.
v.
Depress the pushbutton again for a ½ second and release.
The available pressure is now adopted as the new upper range value.
6.3 UTILIZING THE HART COMMUNICATIONS
The zero procedure is only recommended after the process temperature has stabilized and the SPX
electronics housing has been permanently installed. When the zero trim function is selected (HART
Quick key 1,2,5,1,3,1) the output will be corrected to reflect zero pressure. This is done by the
transmitter electronics automatically by adjusting digital PV to zero and analog output will be 4 mA.
Normally a Zero Trim is all that is required after installation since the Transmitter span has been
calibrated at the factory
In the event the Full Scale output is not correct when checked against a calibrated pressure source or
dead weight tester, the Transmitter span can be adjusted by performing the Sensor Trim function. This is
performed by first applying Zero Pressure and selecting Lower Sensor Trim (HART Quick Key 1, 2, 5, 1, 3,
2) and following the prompts on the HART Communicator. When complete, apply a known calibrated
full scale pressure to the Transmitter and selecting Upper Sensor Trim (HART Quick Key 1, 2, 5, 1, 3, 3)
and follow the prompts on the HART Communicator. When complete, the transmitter electronics will
have adjusted the digital PV to correct to full scale output.
Never perform upper sensor trim without performing lower sensor trim first.
ATTENTION
ATTENTION
ATTENTION
