16
the linearity. If the transmitter displays an incorrect value (±0.5
℃
),contact Sensorex
technical support.
6.2.2
Conductivity Simulation
The following formulas will be useful for the user to simulate the conductivity and verify the
results and linearity.
resistance
=
cell constant
conductivity
e.g.
1.00
cell
0.000010simens
=
100kΩ
conductivity
=
cell constant
resistance
e.g.
1.00
cell
100k
Ω
=
0.000010simens
Step1: Connect a precise resistor between the "Drive" and “Ground" terminals.
Step 2: Set the conductivity in the same manner as the wet calibration procedure.
Step 3: Connect a different value resistor to the "Drive" and “Ground" terminals, and verify
the linearity. If the transmitter displays an incorrect value (±2% of reading), contact Sensorex
technical support.
6.3
Parts per Million (PPM) Factor
When the unit in the calibration menu is PPM, the following information is useful. The PPM factor
is a value between 0.01 and 99.99, and the default value is 2.00.
The formulas are:
PPM Factor
=
solution conductivity(µS/cm)
TDS(PPM)
TDS(PPM)
=
solution conductivity(µS/cm)
PPM Factor
TDS: Total Dissolved Solids.
For example
：
When the solution conductivity = 1000µS/cm and TDS = 500ppm(mg/L), the PPM Factor is 2.00.
7
Troubleshooting
Display
Possible
Cause
Suggestions
Value
Too Large (or Small)!
During temperature
calibration, the entered value
is more than 25 degree away
from the detected value.
1. Check the sensor and repeat
the calibration procedure.
2. Enter appropriate values.
Cell
Can
NOT
Be Zero!
Cell value is set to zero.
Cell value cannot be set to zero,
please set a value larger than zero.
HYSTERESIS Too Large
The HYSTERESIS is larger than
the MAX SETPOINT
Set the HYSTERSIS to a smaller
value than MAX SETPOINT.
