The Interface Solution Experts
23
THZ
2
&
TDZ
2
Programmable Smart HART
Temperature Transmitter and Display
The HART Communicator Menu With a
Device Description
To program your THZ
2
or TDZ
2
, if your communicator
is equipped with the Device Description for
your instrument, follow the steps below. For all
steps outlined below, refer to Figure 15 for menu
parameters.
1. Online Menu–
The
Online
menu displays the
current process value of your application, the lower
and upper range values and the actual output current.
Use the
Device Setup
menu to configure the THZ
2
and
TDZ
2
.
2. Device Setup Menu–
The
Device Setup
menu
allows you to access the following menus:
Process
Variable, Setup, Diagnostic & Services and Review.
3. Process Variable Menu–
The
Process Variable
menu displays the present values of parameters
listed on the Communicator display which include the
selected EGU, output current in percent of span (%
range), analog output and terminal temperature.
4. Setup Menu–
Scroll through the
Setup
menu
to access configuration menus for the following
parameters:
Configure Sensor, Configure Options,
Configure Range, Configure Output, Configure Dev
Info and Configure Display
(for TDZ
2
units only).
A. Configure Sensor
This menu allows access to sensor configuration.
1 Sensor Type
– Select the sensor type you will use
(RTD, Ohms, T/C or Potentiometer). You will navigate
through sub-menus depending upon parameters that
are being set.
2 Sensor Serial Number
– Assign a unique serial
number to your sensor.
3 PV Damping
– Allows you to introduce a delay into
the response of your unit in order to stop short-lived
spikes from appearing as faults and generating fault
messages. The allowable PV Damping range is 0sec
to 30sec.
4 Sensor Information–
Displays the Upper Sensor
Limit (USL), Lower Sensor Limit (LSL) and
minimum
span of the selected sensor type.
B. Configure Options
You may configure the THZ
2
and TDZ
2
options listed
below from the this menu.
1 EGU Selection–
Choose the EGU you wish
displayed.
2 EGU–
View the existing EGU setting.
3 Filter–
This is used to configure the input filter
which helps reduce mains-induced noise. The value
selected should match the frequency of the local AC
supply (50Hz or 60Hz).
4 Running Average–
This feature filters the input
signal. The THZ
2
and TDZ
2
provide this feature with
a user-selected value between 1 and 16. Factory
default is 4.
Note:
A higher Running Average setting provides smoother
output transitions, however, will reduce response
time. Conversely, a lower setting provides a faster
response time, but may seem more unstable.
5 Broken Wire–
If enabled (by selecting
On
) the THZ
2
and TDZ
2
send random microamp pulses through
input wiring to check for broken wiring or a burned out
sensor.
6 AO URV–
Select a value between 3.6mA and
22.6mA as your analog output under range value (AO
URV). If the analog output drops below the set value,
a fault will be declared.
7 AO ORV–
Select a value between 4.6mA and
23.6mA as your analog output over range value (AO
ORV). If the analog output exceeds the set value, a
fault will be declared.
8 Fail Mode–
In the case of a sensor failue, this
determines how the analog output will respond. You
may select a Fail Mode of
High
(proceed to Step
9)
, Low
(proceed to Step 9)
or Hold Last
(last value
present will be held upon a failure)
.
Note:
When setting Fail Mode to Low on the TDZ2 while
it is operating at temperatures below -30 Degree C,
set the Output Fail Current to 3.8mA, or higher, to
ensure full HART communication functionality.
9 Fail Mode AO–
Enter a value to correspond to
your selection in Step 8. If selecting
High
Fail Mode,
enter a value between 20mA to 23.6mA. For
Low
Fail
Mode, select a value between 3.6mA to 4.0mA.
