Honeywell STT25D Operator's Manual page 12

NOTE: Even though the transmitter is working properly, the SFC may display
"CRITICAL STATUS" and an error message when you press "STATUS".
The error messages are "INPUT OPEN" "UNCERTAIN READING" "I/P OUT OF
SPEC".
The "CRITICAL STATUS" message is caused by one of the following:
⇒ You have not connected a sensor to the input.
⇒ There is an open circuit in the sensor, connecting wiring or terminal connections.
⇒ You have connected a T/C or other milli-volt source to the T/C terminals and the
transmitter is configured for RTD input (or vice versa).
3. Press "Status" to verify "Status Check = OK" is displayed.
4. Press "Conf" to access the transmitter database and configure it as required. As
mentioned earlier, the default shipping mode of engineering units is
0-45 mV input, mV range.
You can now customize the unit to your specific application. The flow chart in Figure 4
gives a simplified overview of selections and key strokes.
See SFC Operating Card 34-ST-11-16 for more details on Latching, NAMUR and
Write Protection functionalities.
In summary:
Note that with the "Menu Item" key you can only move to the right.
5. When a desired configuration item appears on the SFC display, this item may be
configured in the SFC "Hold" memory by pressing "Enter".
When you have completed configuring all items accessible via the "STT Conf"
Key, or you try to exit via the "CLR" Key, the SFC will ask "Download Change?".
Press "Yes" (Enter) and the changes will be down-loaded from the SFC to the
transmitter, or press "No" (CLR) and the SFC hold memory will be erased.
6. Having now configured the input type etc., press "LRV " and key in the required
temperature for 4 mA output (e.g. 100°C [212°F]).
7. Press "Enter" to load this into the transmitter and repeat with "URV" for the 20 mA
output (e.g. 500°C [932°F]).
Note that if the input type is changed or the output type is changed from linear
to non-linear (or vice versa), the LRV and URV values will default to factory set
values and the unit selection (°C/°F) will default to °C.
Your STT250 is now configured for your applications.
You can check out the performance by varying the input and observing the output
response on the DVM.
Smart Temperature Transmitter STT250 – Operator Manual
- Press "Next" (or
different categories.
- Press " Menu Item" to access the possible selections of any
category: the è key steps on to the next selection while the
ç key steps back to the previous selection.
) and "Prev" (or ) to scroll through the
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