User guide

2
IM 12D08N05-01E
2. GENERAL SPECIFICATIONS OF EXAxt SC450G
A) Inputs specifications : Two or four electrodes measurement with square wave excitation, using
max60m(200ft)cable(WU40/WF10)andcellconstantsfrom0.005to
50.0 cm
-1
B) Input ranges
 Conductivity : 0.000µS/cm-2000mS/cm
Minimum : 1µS(underrange0.00µSxc.c.)
 Maximum : 200mS(overrange2000mSxc.c.)
 Resistivity : 0.0Ω•cm-1000MΩ•cm
 Minimum : 5Ω/c.c.(underrange0.0Ω/c.c.)
 Maximum : 1MΩ/c.c.(overrange1000MΩ/c.c.)
Temperature
Pt1000 : -20 to 250ºC (0 - 500ºF)
Pt100 : -20 to 200ºC (0-400ºF)
Ni100 : -20 to 200ºC (0-400ºF)
NTC 8k55 : -10 to 120ºC (10-250ºF)
 Pb36(JISNTC6k) : -20to120ºC(0-250ºF)
C) Accuracy
Conductivity/resistivity : ≤0.5%ofreading
 Temperature : ≤0.3ºC(≤0.4ºCforPt100)
 Stepresponse : ≤4secfor90%(fora2decadestep)
Note on performance specifications
The following tolerance is added to above performance.
mA output tolerance: ±0.02 mA of “4-20 mA“
D) Transmission signals
 General : Twoisolatedoutputsof4-20mA.DCwithcommonnegative
Maximumload600Ω.Bi-directionalHART
®
digital communication,
superimposed on mA1 (4-20 mA) signal
 Outputfunction : Linearornon-linear21-steptableforConductivity/Resistivity,
concentration or temperature
Control function : PID control
 Burnoutfunction : Burnup(21.0mA)orburndown(3.6mA)tosignalfailureacc.NAMUR
NE43
: Adjustable damping
: Expire time
Hold : The mA-outputs are frozen to the last/fixed value during calibration/
commissioning
E) Contact outputs
 General : FourSPDTrelaycontactswithdisplayindicators
 Switchcapacity : Maximumvalues100VA,250VAC,5Amps.(*)
Maximumvalues50Watts,250VDC,5Amps.(*)
 Status : High/Lowprocessalarms,selectedfromconductivity,resistvity,
concentration or temperature. Configurable delay time and hysteresis
: PID duty cycle or pulsed frequency control
  : FAILalarm
 Controlfunction : On/Off
: Adjustable damping
: Expire time