Hanna Instruments EC Series User Manual

Operations 8
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 Read Value
EC
BL983313 1413 µS/cm (HI7031) 1413 µS
BL983317 5.00 mS/cm (HI7039) 5.00 mS
BL983320 84 µS/cm (HI7033) 84.0 µS
BL983322 custom calibration solution about 13 µS/cm or higher EC solution value
BL983327 5.00 mS/cm (HI7039) 5.00 mS
TDS
BL983315 84 µS/cm (HI7033) 42.0 ppm
BL983318 6.44 ppt (HI7038) 6.44 ppt
BL983319 1413 µS/cm (HI7031) 919 ppm
BL983321 custom calibration solution about 13 ppm or higher TDS solution value
BL983324 84 µS/cm (HI7033) 42.0 ppm
BL983329 1413 µS/cm (HI7031) 706 ppm
Dosing
contact
min
max
Time
AUTO
OFF
ON
Dosing
contact
min
max
Time
External
Disabling
White or
Brown
Grey
Green
Yellow
Shield
4-20 mA
Output
50/60Hz; 10 VA
115 V
230 V
PE

Hanna Instruments EC Series Specifications

General

Brand	Hanna Instruments
Model	EC Series
Category	Controller
Language	English