2.10 Open/Out of Range Input
If the input to the recorder is open or out of range, the chart motor continues to
run but the recorder handles the situation as follows:
1. Temperature/Humidity Model: When the sensor probe is disconnected, the
pens go to the home position and the display shows “Prb Err”. When the
probe is out of range, the display flashes.
2. Dual Thermocouple Model: When any of the two thermocouple inputs open
up, the pens go to the home position, and the display shows “Prb Err”. When
the input is out of range, the display flashes.
3. Dual Process input Model: When the two inputs are out of range, the display
flashes.
2.11 Pen Jamming
Each pen drive mechanism has two optical sensors. One is to detect the home
position, the other is to detect pen movement. If the pen drive mechanism skips
steps due to wear & tear or dirt & dust over a period of time, the recorder can
compensate for it so that the pens are at the right location on the chart. If the
pens have too much friction or get jammed for any reason, the recorder detects
the situation. It turns off both the pen and the chart motors. It continues to
display the parameters on the LCD and stores data in the memory. The Chart
icon starts to flash to indicate Pen Jamming.
Once the pen drive mechanisms are serviced, and the recorder is powered
back on, the unit continues to operate normally and the chart icon flashing will
disappear.
2.12 Pen Re-scaling
Each or both pens can be re-scaled within the range of the input sensor. Here are
the standard chart ranges for the three models:
Temperature/ Humidity Model -17.7 to 49ºC (0 to 120ºF)
0 to 100% RH
Dual Thermocouple Input
Type K
-40 to 560ºC (-40 to 1040ºF)
Type J
-40 to 260ºC (-40 to 500ºF)
Type T
-40 to 160ºC (-40 to 320ºF)
Dual Process Input
0 to 100%
The pens can be re-scaled thru RS232 from the PC using certain commands. See
Chapter 3 for more details. Once the pens are re-scaled, the Chart icon turns on.
The unit remembers the new pen scales even if the main power is removed. The
chart icon will disappear if the pens are scaled back to factory settings.
Setting Up the Recorder
2
2-15
Summary of Contents for CTXL-TRH-W-W9
Page 64: ...6 2 List of Accessories and Charts Papers 6 Notes...
Page 79: ...NOTES 8 13...
Page 80: ...NOTES 8 14...
