Operations; Calibration - Hanna Instruments EC Series Instruction Manual

Operations

Overtime feature (system control)
• This feature is provided to set the maximum continuous time the relay is running a
pump or valve, by adjusting the trimmer (from approx. 5 minutes minimum, to approx.
30 minutes maximum).
• When the set time expires, dosing stops, the LED operational indicator turns red (blinking),
and "TIMEOUT" message is displayed. To exit, set the dosing switch to OFF then Auto.
• Remove the jumper from the rear panel to disable the feature.
Note: Ensure the dosing switch (front panel) is on Auto for the Overtime feature to be enabled.
External Disabling Contact (NO)
• Normally Open: dosing is enabled.
• Closed: dosing stops, the LED indicator turns red (blinking) and the "HALT" warning
message is displayed.
Note: If the dosing switch is ON, dosing continues even with the external disabling contact closed.
Output terminal: 4-20 mA
• Connect process control signal output
8. OPERATIONS
®
Hanna EC and TDS mini controller series are intended to be used to control industrial processes. Relays and
Outputs are used to interact with valves or pumps to monitor a process.

8.1. CALIBRATION

1. If the instrument is not in measurement mode, press MEAS key.
2. Immerse the probe in calibration solution. See below table for recommended calibration solutions.
3. Shake briefly and allow reading to stabilize.
4. Adjust the CAL trimmer until the LCD displays the nominal value given here:
Series Calibration Solution
BL983313 1413 µS/cm (HI7031)
BL983317 5.00 mS/cm (HI7039)
EC BL983320 84 µS/cm (HI7033)
BL983322 custom calibration solution about 13 µS/cm or higher
BL983327 5.00 mS/cm (HI7039)
BL983315 84 µS/cm (HI7033)
BL983318 6.44 ppt (HI7038)
BL983319 1413 µS/cm (HI7031)
TDS
BL983321 custom calibration solution about 13 ppm or higher
BL983324 84 µS/cm (HI7033)
BL983329 1413 µS/cm (HI7031)
4-20 mA
Output
Grey
Green
White or
Brown
50/60Hz; 10 VA
Yellow
115 V
Shield
230 V
PE
AUTO
OFF
Dosing
contact
External
Disabling
Dosing
contact
Read Value
1413 µS
5.00 mS
84.0 µS
EC solution value
5.00 mS
42.0 ppm
6.44 ppt
919 ppm
TDS solution value
42.0 ppm
706 ppm
8
min
max
Time
min
ON
max
Time