GF Signet 8350 Temperature Transmitter - Manual (Page 4)

4 8350-3 Temperature Transmitter
Delta Temperature (Differential Mode)
If two sensors are connected to the transmitter, the DELTA
(Sensor 1 - Sensor 2) can be assigned to output. To enable
differential mode, the selected output "Source" selection must be
set to "DT".
Sensor 1 must be equal to ID 1. If it is not, go to the Calibrate
menu and switch the sensor ID.
In the example below, Sensor 1 is measuring 80º while sensor 2
is measuring 20º. The delta is 60º ( Sensor 1 - Sensor 2 = 60º)
To track the delta temperature using a 4-20 mA output:
Loop1 Source: DT
Loop1 Range: 0-100
Loop1: = 13.60 mA
To set a delta temperature
setpoint using an Open
Collector output:
Output1 Source: DT
Output1 Mode: Low
Output1 Setpoint: 70
Output1 = ON
Temp1: 25.0 ˚C
Temp2: 25.0 ˚C
ENTER
Signet Temperature
Transmitter
View Menu
3.3 Open Collector Output
The Open Collector output can be used as a switch that responds
when the process value moves above or below a setpoint, or it
can be used to generate a pulsing signal with a rate proportional
to the process value.
• Low:
Output energizes when
process variable is less
than the setpoint. The
output de-energizes
when the process
variable moves above
the setpoint plus the
hysteresis value.
• High:
Output energizes
when process variable
is greater than the
setpoint. The output de-energizes when the process variable
moves below the setpoint plus the hysteresis value.
Hysteresis
Time
Low Setpoint
Process
Relay energized
Relay de-energized
Hysteresis
Time
High Setpoint
Process
10 5
Open Collector Output Rate:
0 to 100 Pulses/min.
endpoint
Pulse rate
0 pulses
100 pulses
Starting point
ENTER
Sensor 1 (80)
Sensor 2 (20)
• Proportional Pulsing
The Open Collector output will generate a 100 mS pulse at the rate defi ned by settings in the
CALIBRATE menu (see page 6)
In the example:
• The output will be 0 pulses/min. at temperatures less than 5º.
• The output will be 50 pulses/min. at 7.5º.
• The output will be 100 pulses/min. at temperatures above 10º.
The starting point, endpoint and maximum pulse rate are select able in the menu.
Display Description
Temp1: 28.7ºC
Temp2: 19.5ºC
Monitor Temperature 1 and Temperature 2 simultaneously.
This is the permanent view display.
DeltaTemperature:
9.2ºC
Monitor the delta temperature (Channel 1 rate - channel 2 rate = Delta
Temperature). This is a permanent display.
The displays below are temporary. After 10 minutes the display returns to the permanent display.
Loop 1 Output:
12.00 mA
Monitor the 4 to 20 mA output for Loop 1 and 2.
Loop 2 Output:
7.65 mA
Last CAL:
02-10-09
Monitor date for scheduled maintenance or date of last calibration.
(See description in Calibrate Menu.)
• During normal operation, ProcessPro displays the VIEW menu.
• When editing CALIBRATE or OPTIONS menus, ProcessPro returns to the VIEW menu if no activity occurs for
10 minutes.
• To select a VIEW display, press the ▲ or ▼ keys. The selections will scroll in a continuous loop.
• Changing the display selection does not interrupt system operations.
• No key code is necessary to change display selection.
• Output settings cannot be edited from the VIEW menu.
4. Menu Functions