Kamstrup MULTICAL 603 Technical Description

MULTICAL®603

120
KamstrupA/S∙Technicaldescription∙5512‐2029_A1_GB_06.2017

9 Temperaturesensors
Aplatinumresistancethermometerutilisesthatthepreciousmetalplatinumhasaverywell‐definedcorrelation
betweenitsresistanceandthetemperature.Thecorrelationbetweentheresistanceandthetemperatureisdefined
inthestandardEN60751(DIN/IEC751)andtablesshowingexamplesofthecorrelationappearfromparagraph9.7.
On
MULTICAL®603,Pt100andPt500temperaturesensorscanbeusedforwhichthenominalresistanceat0°Cis
100Ωand500Ω,respectively.
Thecorrelationbetw eentheresistanceR
t
andthetemperaturet isdefinedas:




󰇛1    

󰇜 
whereR
0
indicatestheresistanceat0.00°C,whereasAandBareconstants.ThevaluesR
0
,AandBaredetermined
attheverificationoftemperaturesensor,whichiscarriedoutaccordingtoEN14 34‐5.
Onaheatorcoolingmeter,atemperaturesensorsetisusedformeasuringthetemperaturedifferencebetween
inletandoutlet.Aseachofthetwotemperaturesensorshasitsown
valuesforR
0
,AandB,therequirementforan
approvedtemperaturesensoris,accordingtoEN1434‐1,thatthemaximumalloweddifferenceinpercentbetween
thetwotemperaturesensors,E
t
,intheentireapprovalareais:




0,5  3
∆

∆


whereΔθistheconcretetemperaturedifferenceandΔθ
min
istheminimumallowedtemperaturedifference,
typically3K.ThevaluesR
0
,AandB,oftheseparatetemperaturesensorsaswellasE
t
appearfromthecertificateof
thetemperaturesensorset.
9.1 Cableinfluen ceandconnectionofcables
Mostly,onlyrelativelyshortcablelengthsfortemperaturesensorsareneededforsmallandmedium‐sizeheat
meters,whichmeansthat2‐wiresensorsetscanbeusedwithadvantage.



Cablelengthsandcrosssectionsofthetwosensorswhichareusedastemperaturesensorpairforaheat
meter
mustalwaysbeidentical,andcablesensorsmustneitherbeshortenednorextended.


Kamstrup MULTICAL 603 Specifications

General

Flow Sensor	Ultrasonic
Battery Life	Up to 16 years
Power Supply	Battery
Communication Options	M-Bus, Wireless M-Bus, Modbus, BACnet
Display	LCD
Application	Heating and Cooling
Pressure Rating	PN16
Approval	MID
Accuracy	Class 2
Ambient Temperature Range	55°C
Housing Material	Brass