Moore Industries TDZ3, Руководство пользователя

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www.miinet.com Moore Industries-International, Inc.
- 15 -
User’s Manual
238-741-00K
May 2019
Programmable Smart HART Temperature Transmitter
THZ
3
/ TDZ
3
Figure 2.2.
Power Supply and Loop connections
See Figure 2.2 for the power supply and loop connections. The TDZ
3
is shown, but the power
supply and loop connections for the THZ
3
[HPP] and THZ
3
[DIN] will be similar.
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 ohm
for proper HART
Communications
ADDR ADDR A
TDZ
3
Calibration
Every THZ
3
/TDZ
3
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 THZ
3
/TDZ
3
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 THZ
3
/TDZ
3
by calibrating
its analog output to the device that is receiving the output (such as a DCS). This ensures that the
output of the THZ
3
/TDZ
3
is being correctly interpreted.
Calibration using a HART handheld communicator
To perform the Input Trimming of the THZ
3
/TDZ
3
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 THZ
3
/TDZ
3
Device Description loaded)
Device
Specifications
Millivolt or
Resistance Source
Power Supply
Load Resistor
Multimeter
HART Communicator
SECTION 2