www.miinet.com
Moore Industries-International, Inc.
- 45 -
User’s Manual
238-741-00K
May 2019
Programmable Smart HART Temperature Transmitter
THZ
3
/ TDZ
3
SECTION 4
The following additional features may also be useful:
Sensor Trimming
Sensor Trimming increases the measurement accuracy of your instrument by trimming the
reading of its actual input, to either a calibrated source or the device to which it is connected.
This verifies that the input to the transmitter is being interpreted correctly. You may trim any point
between 0% and 100% along the scale. Note that one-point trimming applies an offset to the
sensor reading, while two-point trimming applies both an offset and a gain.
Trimming can be applied to one or both sensors (SEN1 & SEN2).
Running Average Filter
This function filters the sensor input signal with a user-selected range between 1 and 16. A
higher Running Average Filter setting provides smoother output transitions; however, increases
response time. Conversely, a lower setting provides a faster response time, but may seem more
unstable.
Filter
This setting is used to configure the input filter. The filter is designed to reduce the effects of
mains induced noise. The input filter frequency value should be set to the frequency of the local
AC supply–either 50Hz or 60Hz.
Scaling
Scaling can be applied to any Device Variable including Sensor 1 and Sensor 2. It provides for a
linear transformation from the Device Variable’s units to any other engineering unit (EGU). Two
points are specified (Input minimum, Scale minimum) and (Input maximum, Scale maximum).
When scaling is enabled, no unit checking is done. It is possible to convert the value from one
unit to another by configuring for unity scaling eg, (0, 0 and 100, 100). However this should be
unnecessary.
Custom Curve (Advance Settings)
The unit provides the capability to program 4 independent custom curves (CC1-4) which can be
applied to any available Device Variable to define a non-linear scaling. Each Custom Curve can
contain up to 128 pairs (X, Y) where X is the input and Y the output.
Custom Curves cannot be entered using the HART Communicator, they must be entered via the
FDT/DTM. However, once a custom curve has been saved in the unit it can be assigned and
enabled or disabled using the HART Communicator.
PV Settings
There are a few settings which apply specifically to the PV:
•
PV Upper Range Value (URV) and Lower Range Value (LRV): Used to scale the PV to
the Percent of Range and Loop Current values. These settings are independent from any
other scaling settings.
•
PV Damping: PV Damping allows you to introduce a delay into the response of your unit in
order to stop short-lived spikes from initiating faults and generating fault messages. The
damping time setting is the time PV takes to make a 63% change in response to a step
change.
