General specifications of exaxt sc450g – Yokogawa EXAxt SC450 4-Wire Analyzer for Conductivity/Resistivity User Manual
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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