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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
Summary of Contents for OMP-MODL
Page 1: ......
Page 9: ...1 INTRODUCTION USING THE MODULOGGER 1 7 13 ...
Page 23: ...2 OMP MODL System Base Using the OMP MODL 2 14 NOTES ...
Page 24: ...2 ModuLogger System Base Using the ModuLogger 2 1 ...
Page 30: ...3 INTERFACE MODULES USING THE OMP MODL 3 6 NOTES ...
Page 70: ...3 INTERFACE MODULES USING THE OMP MODL 3 46 NOTES ...
Page 76: ...3 INTERFACE MODULES USING THE OMP MODL 3 52 NOTES ...
Page 82: ...3 INTERFACE MODULES USING THE OMP MODL 3 58 NOTES ...
Page 83: ...3 INTERFACE MODULES USING THE MODULOGGER 3 1 ...
Page 105: ...5 HYPERCOMM COMMUNICATIONS USING THE OMP MODL 5 18 NOTES ...
Page 106: ...5 HYPERCOMM COMMUNICATIONS USING THE MODULOGGER 5 1 ...
Page 117: ...6 PCMCIA CARD CONFIGURATION AND USE USING THE MODULOGGER 6 1 ...
Page 134: ...7 HYPERNET ICON BASED PROGRAMMING USING THE OMP MODL 7 17 NOTES ...
Page 141: ...8 P P C D U OMP MODL ...
Page 149: ...9 HYPERPLOT GRAPHIC DATA DISPLAY USING THE OMP MODL 9 8 ...
Page 161: ...10 HYPERTRACK REAL TIME DATA DISPLAY USING THE OMP MODL 10 12 NOTES ...
Page 162: ...10 HYPERTRACK REAL TIME DATA DISPLAY USING THE OMP MODL 10 1 ...
Page 163: ...11 APPENDICES USING THE OMP MODL 11 1 11 APPENDICES ...
Page 164: ...11 APPENDICES USING THE OMP MODL 11 2 NOTES ...
Page 270: ...11 APPENDIX A MASTER ICON FILE REFERENCE USING THE OMP MODL 11 108 ...
Page 276: ...11 APPENDIX C HYPERWARE FILE LISTING USING THE OMP MODL 11 114 NOTES ...
Page 278: ...11 APPENDIX C HYPERWARE FILE LISTING USING THE OMP MODL 11 116 NOTES ...
Page 279: ......
Page 282: ...11 APPENDIX E CHANGING THE OMP MODL EPROM USING THE OMP MODL 11 120 NOTES ...
Page 288: ...11 APPENDIX G HYPERNET THEORY OF OPERATION USING THE OMP MODL 11 126 NOTES ...
Page 290: ...11 APPENDIX I RS 232 CABLE PORT AND ADAPTER USING THE OMP MODL 11 128 NOTES ...
Page 297: ...11 APPENDIX K MODEM CONFIGURATION USING THE OMP MODL 11 135 ...