Extech Instruments 48VTR User Manual page 19

tyPE Sensor input selection. Select from the list below:
Setting Input type
00 J type thermocouple
01 K type thermocouple
02 T type thermocouple
03 E type thermocouple
04 B type thermocouple
05 R type thermocouple
06 S type thermocouple
07 N type thermocouple
08 RTD Pt100 ohm (DIN)
09 RTD Pt100 ohm (JIS)
10 Linear mode (voltage or
current input)
LoLt Low limit (of Span). Refer to SPAN paragraph below.
HiLt High limit (of Span). Refer to SPAN paragraph below.
A Note about SPAN
SPAN is an important 48VTR parameter and is found by subtracting the Low Limit (LoLt)
from the High Limit (HiLt) parameters. The size of the SPAN affects the size of the
Proportional Band ('Pb') in the 2
hysteresis parameters in the 3
In addition, the SPAN dictates the highest and lowest readings possible for SV and PV
displays. Setpoints and PV readings cannot be displayed higher than the high limit or lower
than the low limit. The user programs the SPAN size by setting the low limit ('LoLt') and
high limit ('HiLt') parameters in the 3
Note that low limit and high limit settings are limited to the range of the selected input type.
To check the allowable low and high limit settings, refer to the ranges listed in the
Specifications section of this manual for the input type in question.
Fourth Programming Menu Level
Press and hold the SCROLL and RETURN keys simultaneously for 5 seconds to enter the
th
4 menu level from the 3rd menu level. To return to normal operation at any time, press
the RETURN key.
LoCA and HiCA
Low and High Input Calibration values. Refer to 'Calibration' Section for
details.
tunE Auto Tuning 'initialization mode' selection. This parameter allows the user to
select when an Auto Tune session is automatically initiated by the controller.
Set this parameter as desired from the Table in the Auto Tuning section of this
manual.
To activate Auto Tune manually, refer to the Auto Tuning Section of this
manual.
Notes
The controller is offered in one of four input
configurations; Thermocouple, RTD, Voltage or
Current input.
Conversion from one input type to another
requires a hardware modification. Contact Extech
for information.
For thermocouple configured units, the user can
select from the eight (8) thermocouples shown in
the 'Input Type' column of this table by simply
changing the 'tyPE' setting.
nd
Menu Level and the size of the deadband for the
rd
Menu Level ('Hyst' and 'A1HY').
rd
Menu Level.
19 Model 48VTR - Version 5.0 – January 2006