AC Carrier or DC Strain Gage
Conditioner Indicator
Model 7541
DESCRIPTION
These advanced instruments provide engineering unit display
of a strain gage (mV/V) input and a frequency input. They also
compute power and perform 21 functions including limit checks,
tare, hold and max./min. capture. You needn’t write code or add
hardware to be up and running a productive test.
The alphanumeric readout can display measured and computed
data, units of measure, and test status. During setup, it guides
you with English language prompts. There are no manual adjust-
ments. To calibrate, enter the full scale value in engineering units
and auto-cal takes over. Provides 0.01 % (max.) resolution and
±5 V and/or ±10 V analog outputs at full scale. The keyboard ac-
cesses measured data, held data, max./min. data, data spread,
limit status, and/or I/O status without disruption. Password pro-
tection may be used, if needed.
FEATURES
• Maybecalibratedintwodirections(clockwiseandcounter-
clockwise or tension and compression)
• Fast,rock-solidreadingswithhighnoiseimmunity-2000
samples/sec for torque, head, or drawbar force input - 1 ms
response for speed
• Oneortwochannelinput
• Six-digitengineeringunitwithlegendsand0.01%resolu-
tion max.
• RS-232,RS-422,RS-485serialcommunication
• Auto-scaled±5Vand/or±10Vanalogoutputs
• Nopots,batteries,fans,maintenance,orexternalpower
supplies
• Excitation:accarriermodels,3.28kHz,3Vrms;dcmodels,
5 V or 10 V dc, user selectable
• CEapproved
Order code
7541-111 acexcitation,singledisplay
7541-112 acexcitation,dualdisplay(twoinputs)
7541-115 acexcitation,torque,RPM,hp(displays2ofthe3)
7541-101 dcexcitation,singledisplay
7541-102 dcexcitation,dualdisplay(twoinputs)
7541-105 dcexcitation,torque,RPM,hp(displays2ofthe3)
2Honeywell•SensingandControl
Model 7541
GENERAL SPECIFICATIONS
Characteristic Measure
Straingageinput Any80ohmto2Kohmtransducer,di-
rectlywiredortransformercoupled.4,6,
or 7 wire circuits are accommodated
Transducer excitation,
ac models
3Vrms,3.28kHz±0.01%sinewave.
Regulatedandshortcircuitprotected
Transducer excitation,
dc models
5 V or 10 V dc, user selectable, regu-
lated
Sensitivity 1.0mV/Vto4.5mV/Vwith50%over-
range;automaticallyscaled
Input resistance 100mohminparallelwith33pF
Automaticnull InPhase:±10%offullscale(with50%
overrange),±60%offullscale(with0%
overrange).Quadrature:±1mV/V
Autocalibration Dual polarity shunt calibration with provi-
sionforCALresistorfeedback
Spurioussignalrejection 60Hz:120dBcommonmode,100dB
normalmode.Carrierquadrature:60dB
Anti-aliaslter 200Hz,7-poleBesselresponselter
Low-passltering Four-poleBesselresponsedigitallter
with11cutofffrequenciesfrom0.1Hzto
200Hzin1-2-5steps
ENVIRONMENTAL SPECIFICATIONS
Characteristic Measure
Temperatureeffects,zero ±0.001%offullscale/°Fmax.
Temperature effect, span ±0.001%offullscale/°Fmax.
Frequencyinput Anyunidirectionalorbidirectional
(quadrature) source including self-
generatingandzerovelocitymagnetic
pickups, optical encoders, flowmeters,
etc. When used with bidirectional sen-
sors, the conditioner outputs both direc-
tion and magnitude
Input impedance and
conguration
Differential or single ended inputs. 100
kohm differential, 50 kohm single ended
Input threshold
(keypad selectable)
10, 20, 50, 100 or 200 mV pk-pk (be-
tweeninputs)orTTL
Maximumvoltage ±130Vdcor130Vrms
Input signal bandwidth 0.001kHzto200kHz(10mVto200mV
pk-pkthreshold)0.001kHzto400kHz
(TTLthreshold)
Display ranges and
resolution
Rangeless(useanyfullscaleengineer-
ing unit value) with 50 % overrange.
Resolutionis0.01%offullscale
Lowpasslter
(keypad selectable)
20kHz(-3dB)ornone(thislterisnot
availableforTTLinputs)
Responsetime Greaterof:1ms,typ(2msworstcase)
or the input pulse length
Commonmoderejection 80dB(60Hz),55dB(0kHzto10kHz)
Lowpasslteringof
sampled data
Unlteredorfour-poleBessellter.Cut-
offfrequenciesfrom0.1Hzto100Hzin
1-2-5 steps
Overall accuracy 0.01%offullscale@25°C[77°F],
0.015%offullscale@5°Cto50°C[41
°Fto122°F]
Excitation supplies 12V@125mA2or5V@250mA2.
Shortcircuit(currentlimitandovervolt-
age (fuses) protected
Maximumtransducer
cable length
500 ft, except 200 ft for 100 ohm or
lower strain gage transducers
ELECTRICAL SPECIFICATIONS
Characteristic Measure
Signal-to-noiseratio1With1/10/100/200Hzlters86/76/66/62
dB@1mV/Vfullscaleand86/80/72/66
dB@5mV/VFS
Resolution 0.01 % of full scale
Overall accuracy @
25°C[77ºF]
0.02 % of full scale, worst case.
DISPLAY SPECIFICATIONS
Characteristic Measure
Systemdisplay Twolineby16alphanumericcharac-
ters,each0.2inwideby0.3inhigh.
BacklitLCDwithadjustablecontrast
Views Selecteithertwochannels,oneChannel
with limit status or one channel with I/O
status
Data displayed Selectfromcurrent,max.,min.,spread,
held data and tare value
Data format Engineering units with six digits (1-2-5
format)andvecharacter,upperor
lower case, user-entered legend/de-
scriptor
SYSTEM RESPONSE (PER CHANNEL)
SPECIFICATIONS
Characteristic Measure
Data samp. & max./min.
update rates
2000Hz(hardwarechannels),50Hz
(CH3calculation)
Limitcheckingrate 1000Hz(hardwarechannels),50Hz
(CH3calculation)
LogicI/Oresponsetime 1ms(hardwarechannels),20ms(CH3
calculation)
Update rate for each
analog output
1000Hz
Honeywell•SensingandControl3
AC Carrier Strain Gage Conditioner Indicator
MECHANICAL SPECIFICATIONS
Characteristic Measure
Size(WxHxD) 165,1mmx73,66mmx220,98mm[6.5
inx2.9inx8.7in]
Weight 3lb
Operating temperature 5°Cto50°C[41°Fto122°F]
Input power 90Vacto250Vac,50/60Hz@25VA,
max.Two2A/250Vfuses,linelterand
rear power switch
SYSTEM SPECIFICATIONS
Characteristic Measure
Systemcontrol AllI/Ofunctionscanbeorderedinany
combination. The pattern function adds
ANDingcapabilities
Input actions/channel Logicinputs,outputsandinternalMatrix
signalscontrolthefollowingactions:
tare, clear tare, hold, clear hold, reset
max./min., clear latched limits, check
limits,domax./mins.,apply+CAL
Output events/channel The following events drive logic outputs
andinternalMatrixsignals:HIlimit,NOT
HIlimit,INlimit,NOTINlimit,LOlimit,
NOTLOlimit,atmax.,NOTatmax.,at
min.,NOTatmin.
Threeuser-denedpatterns Patterns of logic inputs, outputs and
MatrixsignalsdriveLogicoutputsand
internalMatrixsignals
LimitChecking EachchannelhasaHIandLOlimit
which may be latched or unlatched,
absolute or signed, and with or without
hysteresis.Selecteithercurrent,max.,
min. spread or held data for limit
checking.Limitviolationsonanyorall
channels can be set to trigger back-
light flashing in any of the display view
modes
LOGIC INPUTS SPECIFICATIONS
Characteristic Measure
FourLogicinputs Each with programmable destination,
protectedto±130Vdcor130Vrms
FourLogictype TTLcompatible,ScmittTrigger,low-true
with47kohmpull-up.Inputcurrentis
-100µA@0V
SixLogicoutputs Each with programmable source, short
circuit (current and thermal limits) and
overvoltage (fuse) protected.
SixLogictype Open collector, low-true. Operating @
24V(max.)and0.3Amaxsinkcurrent
External +5 Vdc power
(on I/O conn.)
250mA,shortcircuit(currentlimit)and
overvoltage (fuse) protected.
Serialcommunicationport (selectableasRS232,RS422orRS485)
Supports32devicesonRS485portand
1deviceonRS232/422
Baudrate 300to38400.Maximumcablelength:
4000ft(RS422/RS485),50ft(RS232)
120 ohm terminal resistors
(RS485)
UserselectableforRXDandTXD
RS422/485transceivers Slew-ratelimited,shortcircuitprotected
(current and thermal limits)
RS232drivers Shortcircuitprotected(currentlimit)
SerialI/Os Use a nine-pin D connector. ±15 kV
ESDprotectedandoat(100kohm)
with respect to earth ground
Commands Controlofallmodes,settingsandmeas-
urements
Non-volatilememory
storage settings
EEPROM,batteriesarenotused
Dual analog outputs Each assignable to any of the three
channels are short circuit (current limit)
and overvoltage (fuse) protected
Output impedance/min.
load resis.
< 1 ohm/10 kohm
Fullscale ±5Vor±10V(userselectable).Resolu-
tionis2mV@±5Vfullscaleor4mV@
±10 V full scale
Overrange ±8.2V@±5Vfullscaleor±13.5V@
±10 V full scale
Nonlinearity ±2mV@±5Vfullscaleor±4mV@
±10 V full scale
Overall error
(worst case, incl. temp.
effects)
±5 mV @ ±5 V full scale or ±10 mV @
±10 V full scale
Filter 100Hz,5poleBesselresponselow
passlter
SensingandControl
AutomationandControlSolutions
Honeywell
1985DouglasDriveNorth
GoldenValley,MN55422USA
+1-815-235-6847
www.honeywell.com/sensing
008816-2-EN IL50 GLO
December 2008
Copyright © 2008 Honeywell International Inc. All rights reserved.
Model 7541 AC Carrier Strain Gage Conditioner Indicator
Warranty. Honeywellwarrantsgoodsofitsmanufactureas
being free of defective materials and faulty workmanship.
Honeywell’sstandardproductwarrantyappliesunlessagreed
tootherwisebyHoneywellinwriting;pleaserefertoyour
orderacknowledgementorconsultyourlocalsalesofcefor
specicwarrantydetails.Ifwarrantedgoodsarereturnedto
Honeywellduringtheperiodofcoverage,Honeywellwillrepair
orreplace,atitsoption,withoutchargethoseitemsitnds
defective. The foregoing is buyer’s sole remedy and is in lieu
of all warranties, expressed or implied, including those of
merchantability and tness for a particular purpose. In no
event shall Honeywell be liable for consequential, special, or
indirect damages.
While we provide application assistance personally, through our
literatureandtheHoneywellwebsite,itisuptothecustomerto
determine the suitability of the product in the application.
Specicationsmaychangewithoutnotice.Theinformationwe
supply is believed to be accurate and reliable as of this printing.
However,weassumenoresponsibilityforitsuse.
FormoreinformationaboutSensingandControlproducts,visit
www.honeywell.com/sensingorcall+1-815-235-6847
Email inquiries to info.sc@honeywell.com
WARNING
PERSONAL INJURY
•DONOTUSEtheseproductsassafetyoremergency
stopdevicesorinanyotherapplicationwherefailureof
theproductcouldresultinpersonalinjury.
Failure to comply with these instructions could result in
death or serious injury.
WARNING
MISUSE OF DOCUMENTATION
•Theinformationpresentedinthiscatalogueisfor
referenceonly.DONOTUSEthisdocumentasproduct
installationinformation.
•Completeinstallation,operationandmaintenance
informationisprovidedintheinstructionssuppliedwith
eachproduct.
Failure to comply with these instructions could result in
death or serious injury.
Notes
1.Theratioexpressedindecibels(dB),offullscale(FS)tonoisespread.
Measurementsaremadeforaone-minuteintervalusinga350ohm
bridge.
2.Bothexcitationvoltagescanbeusedsimultaneouslywiththefollowing
restrictions:4.8x(12Vcurrent)+(5Vcurrent)<700mA;12Vcur-
rent<125mA;5Vcurrent<250mA.
3.Appliestostraingagechannelonly.Frequencymeasurementis
absolute with enhanced accuracy and only requires user engineering
unit scale.
4.Specicationissubjecttochangewithoutnotice.