www.miinet.com
Moore Industries-International, Inc.
- 16 -
User’s Manual
238-760-00K
May 2019
Moore industries-International, Inc.
Figure 2.2.
Power Supply and Loop connections
See Figure 2.2 for the power supply and loop connections. The STZ [HP] is shown, but the
power supply and loop connections for the STZ [HPP] and STZ [DIN] will be similar.
ADDR
ADDR
ADD
STZ
12-24Vdc
Power
Supply
Load= 250 ohm
+
-
The HART Communicator
can be connected to any
point on the output side of
the loop. Total loop
resistance must equal
between 250 to 1,100 ohms
for proper HART
Communications
Calibration
Every STZ is calibrated to our specifications prior to delivery to our customers. We recommend
that you check the calibration every year and re-calibrate only when necessary. Please refer
to the Long Term Stability Table in Section 8 of this manual. Calibration by the end user can be
performed in the field by capturing or trimming the input and/or trimming the analog output.
Sensor trimming increases the measurement accuracy of your instrument by matching the
reading of its actual input to its scaling. The STZ offers the use of a trimming feature that can be
accessed using a HART Communicator, a HART Host, or an FDT Host (such as PACTware).
Likewise, output trimming increases the measurement accuracy of the STZ by calibrating its
analog output to the device that is receiving the output (such as a DCS). This ensures that the
output of the STZ is being correctly interpreted.
Calibration using a HART handheld communicator
To perform the Input Trimming of the STZ set up the equipment in Table 2.1 as shown in Figures
2.1 thru 2.4.
Table 2.1.
Necessary Equipment
Accurate to ±0.05% of span for the intended application.
24Vdc, ±10%
250 ohms with ±0.01% precision
Calibrated to an accuracy of ±0.025%, or better; such as Fluke Model 725, or similar
Any HART HandHeld Communicator or Host (with STZ Device Description loaded)
Device
Specifications
Millivolt or
Resistance Source
Power Supply
Load Resistor
Multimeter
HART Communicator
Functional Safety Dual Input Smart HART® Temperature Transmitter
STZ
SECTION 2
