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3... I
NTERFACE
M
ODULES
U
SING
T
HE
OMP-MODL
3-40
MLIM-4; RTD I
NPUT
A
PPLICATION
The RTD function of the MLIM-4 allows for the input of Platinum RTD’s with any of
the following characteristics:
♦
100 or 1000 ohm @ 0’ C
♦
European (0.0385) or American (0.0392) alpha coefficient curve
♦
2, 3, or 4-wire configuration
The actual temperature is calculated from the resistance and can be output in either
degrees C or F. Two input temperature ranges are provided for maximizing span
and ultimate resolution of the readings. The RTD element resistance is measured
using a constant current ratiometric technique which provides excellent accuracy
and stability over time and temperature.
Refer to the Excitation Current Table for current levels utilized in the excitation of
the RTD elements.
MLIM-4; T
HERMISTOR
I
NPUT
A
PPLICATION
The Thermistor function of the MLIM-4 allows for the input of 10,000 ohm @ 25C
NTC thermistors conforming to the Fenwall Curve 16 or equivalent RT curve.
The actual temperature is calculated from the resistance and can be output in either
degrees C or F. Four input temperature ranges are provided for maximizing span
and ultimate resolution of the readings. The Thermistor element resistance is
measured using a constant current ratiometric technique which provides excellent
stability over time and temperature. Due to the high resistance vs temperature ratio,
only 2-wire configuration is provided (and required).
Refer to the Excitation Current Table for current levels utilized in the excitation of
the Thermistor element under test.
MLIM-4; R
ESISTANCE
I
NPUT
A
PPLICATION
The Resistance function of the MLIM-4 can measure resistances ranging from 200
ohm to 400,000 ohm full scale. 2, 3, or 4-wire configurations can be used depending
on absolute accuracy requirements.
Twelve input resistance ranges are provided for maximizing span and ultimate
resolution of the readings. The resistance is measured using a constant current
ratiometric technique which provides excellent stability over time and temperature.
Refer to the Excitation Current Table for current levels utilized in the excitation of
the resistance elements being measured.
MLIM-4; I
NPUT
S
IGNAL
C
ONNECTION
M
ETHODS
:
For all three signal types, RTD, thermistor, and resistance, a ratiometric resistance
measurement technique is used. In the case of the RTD and thermistor
measurements, a software conversion is then used to convert this resistance into
temperature.
In measuring the resistance of a distant element with a conventional 2-wire
connection configuration, the resistance of the lead wires running from the module
terminal strip to the actual sensing element itself will add resistance and
corresponding error. The magnitude of these errors depends on the resistance of the
lead wires which is a function of wire gauge, temperature, and any connection
resistance. If the resistance is small relative to the resistance being measured, this
RTD Input
Thermistor
Input
Resistance
Input
Содержание OMP-MODL
Страница 1: ......
Страница 9: ...1 INTRODUCTION USING THE MODULOGGER 1 7 13 ...
Страница 23: ...2 OMP MODL System Base Using the OMP MODL 2 14 NOTES ...
Страница 24: ...2 ModuLogger System Base Using the ModuLogger 2 1 ...
Страница 30: ...3 INTERFACE MODULES USING THE OMP MODL 3 6 NOTES ...
Страница 70: ...3 INTERFACE MODULES USING THE OMP MODL 3 46 NOTES ...
Страница 76: ...3 INTERFACE MODULES USING THE OMP MODL 3 52 NOTES ...
Страница 82: ...3 INTERFACE MODULES USING THE OMP MODL 3 58 NOTES ...
Страница 83: ...3 INTERFACE MODULES USING THE MODULOGGER 3 1 ...
Страница 105: ...5 HYPERCOMM COMMUNICATIONS USING THE OMP MODL 5 18 NOTES ...
Страница 106: ...5 HYPERCOMM COMMUNICATIONS USING THE MODULOGGER 5 1 ...
Страница 117: ...6 PCMCIA CARD CONFIGURATION AND USE USING THE MODULOGGER 6 1 ...
Страница 134: ...7 HYPERNET ICON BASED PROGRAMMING USING THE OMP MODL 7 17 NOTES ...
Страница 141: ...8 P P C D U OMP MODL ...
Страница 149: ...9 HYPERPLOT GRAPHIC DATA DISPLAY USING THE OMP MODL 9 8 ...
Страница 161: ...10 HYPERTRACK REAL TIME DATA DISPLAY USING THE OMP MODL 10 12 NOTES ...
Страница 162: ...10 HYPERTRACK REAL TIME DATA DISPLAY USING THE OMP MODL 10 1 ...
Страница 163: ...11 APPENDICES USING THE OMP MODL 11 1 11 APPENDICES ...
Страница 164: ...11 APPENDICES USING THE OMP MODL 11 2 NOTES ...
Страница 270: ...11 APPENDIX A MASTER ICON FILE REFERENCE USING THE OMP MODL 11 108 ...
Страница 276: ...11 APPENDIX C HYPERWARE FILE LISTING USING THE OMP MODL 11 114 NOTES ...
Страница 278: ...11 APPENDIX C HYPERWARE FILE LISTING USING THE OMP MODL 11 116 NOTES ...
Страница 279: ......
Страница 282: ...11 APPENDIX E CHANGING THE OMP MODL EPROM USING THE OMP MODL 11 120 NOTES ...
Страница 288: ...11 APPENDIX G HYPERNET THEORY OF OPERATION USING THE OMP MODL 11 126 NOTES ...
Страница 290: ...11 APPENDIX I RS 232 CABLE PORT AND ADAPTER USING THE OMP MODL 11 128 NOTES ...
Страница 297: ...11 APPENDIX K MODEM CONFIGURATION USING THE OMP MODL 11 135 ...