Applications Guide
Modline 5
145
the selected Reset Below temperature. The system will then return to direct temperature indication until
a new target comes into view. The Decay Cycle will repeat as describe above.
Delaying the start of the peaking action allows peaked temperature measurement of targets with hot
leading edges and cooler middle temperatures without peaking on the hotter leading edge. The delay
time selected determines at what position or point on the target peaking action begins. This function
may be affected by a slow Response Time which could further delay the start of peaking action.
Example: Before a moving work piece enters the target viewing area, the System may be sensing a
measured temperature below the selected Reset Below temperature. As the target comes into view, the
hotter temperature is sensed and the Peak Picker Delay time-out begins. When the delay is completed,
the system will begin peaking action on the measured temperature until the work piece passes the
Sensor.
Figure 84: Peak Picker Delay
8.7
Track and Hold
The Modline 5 includes a Track and Hold function that allows continuous temperature measurement
in the Track mode and suspended measurement in the Hold mode with the last temperature reading
held. Selection of the Track and Hold function is made with the Sensor rear panel SIGL menu and TRAK
function or the RS-485 TS Command.
8.7.1
External Switch Control of Track and Hold
The Modline 5 has provisions for a remote process controlled input switch be wired to the Violet and
Violet/White twisted wire pair of the Sensor’s interconnecting cable. If Track and Hold signal operation
is selected, the switch input is required to change from Track temperature operation to Hold
temperature mode as required in the process system.
illustrates Track and Hold operation.
The Sensor will be in the Track Mode with the switch open and in the Hold mode with the switch closed.
• The remote switch may be manually operated or it may be a contact on a timer, relay, or
movement of a target or its timing in the process to close the remote switch.
The Delay Time can be used with the Auto Reset turned off. In this case, the Delay will
only begin after a reset occurs. See sub section Peak Picker Reset above for how to
initiate a reset.
Sensor Output
Target Temperature
Reset Below Temperature
Delay Time
Time
Signal
Peak Picker with Delay Time
