P/N: 974153 |
Rev: 072016
|
ECO: 46503
www.dynisco.com
From lab to production,
providing a window into the process
-30-
URV or Full Scale Turndown is performed by applying any pressure, within the 6:1 ratio of the
transmitter that you want to be the 20 mA point. When the pressure is held steady:
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 SPX has now adjusted the URV 20 mA point to match the pressure applied.
6.8 RERANGING VIA HART
Rerange LRV (4)
This is the pressure at which the transmitter will output 4 mA as entered directly by the user. Changing
the LRV affects the transmitter span so the is range is limited by the minimum span value found in Fast
Key (1,4,1,5)
Rerange URV (5)
This is the pressure at which the transmitter will output 20 mA as entered directly by the user. This
range is limited by the minimum span value found in Fast Key (1,4,1,5)
Rerange LRV By Applying Pressure (1,2,5,1,1,1,1)
This is done by applying a known pressure and initiating the procedure so that the transmitter adopts
the pressure as the 4 mA point.
Note: This should only be performed with a Calibrated Pressure Source.
Rerange URV By Applying Pressure (1,2,5,1,1,1,2)
This is done by applying a known pressure and initiating the procedure so that the transmitter adopts
the pressure as the 20 mA point.
Note: This should only be performed with a Calibrated Pressure Source.
Recall Factory Trim (1,2,5,3)
This is used to restore the Zero, Lower, and Upper Trim to the Values as set from the Factory.
R-Cal Set % (1,2,5,1,4,1)
This is used on versions with a Rcal. By activating R-Cal, the output will be set to the percentage of span
set by this function. Default is 80%. Setting Rcal to 0%, disables the Rcal function.
Damping (1,3,5)
The damping time constant affects the speed with which the primary output signal reacts to changes in
pressure as shown in the figure on the following page. Damping is off by default but values between 0
and 30 seconds can be set using the handheld communicator. The damping value must be entered in
integers. If non-integers are entered, the system rounds to the next integer.
ATTENTION
