Instruction manual

1 Overview
7
1.3 Specifications
Product name Industrial conductivity meter
Model HE-480C
Measurement
method
Electrode type (2-electrode method)
Cell constant 0.01/cm, 0.1/cm, or 1.0/cm
Temperature
sensor
specifications
Platinum resistance 1000 Ω/0°C; temperature coefficient 3750 ppm/°C standard
Measuring range
Cell constant (/cm) 0.01 (ESD/ESL-001) 0.1 (ESD/ESL-01) 1.0 (ESD/ESL-1)
Measurement range
(
µS/cm)
2.000/20.00 20.00/200.0 200.0/2000
Measurement range
(mS/m)
0.2000/2.000 2.000/20.00 20.00/200.0
TDS conversion
(mg/L)
2.00/20.0 20.0/200 200/2000
Temperature 0°C to 100°C
Repeatability (in
equivalent input)
Conductivity display Within ±0.5% of the full scale
TDS conversion
display
Within ±1.5% of the full scale
Linearity (in
equivalent input)
Conductivity display Within ±0.5% of the full scale
TDS conversion
display
Within ±1.5% of the full scale
Transmission
output
4 mA to 20 mA DC: input/output isolated type
Maximum load resistance: 900 Ω
Transmission output range: Freely selectable within the measurement range
Contact output
Outputs: 2 points
Alarm contact output (R1 and R2)
Contact type: relay contact, SPDT (1c)
Contact rating: 240 V AC, 3 A and 30 V DC, 3 A (resistance load)
Contact function: selectable from upper/lower limit operation (ON/OFF control), alarm,
and maintenance.
Calibration function
Conductivity: Based on the specified compensation coefficient for the cell constant
(parameter input)
Temperature: Calibrated by comparing with the reference thermometer
TDS: Conversion using a user-defined coefficient value (0.30 to 1.00)
Transmission
output hold feature
z Previous value hold
z Optional value hold
z Continuous
Selectable from the above (However, only the previous value hold is available in the
maintenance mode.)
Self-diagnosis
function
z Sensor diagnosis
Short-circuit and disconnection of the temperature sensor
z Out of the measurement range
z A/D converter scale over
z Converter error
Temperature
compensation
z Based on the temperature characteristics of extra deionized water (reference temperature:
25°C)
z Based on the temperature characteristics of NaCl
z Based on the reference temperature and user-defined temperature coefficient
(reference temperature: 5°C to 95°C, temperature coefficient ±5%/°C)
z No temperature compensation