Installation - Hanna Instruments Groline HI981412 Instruction Manual

6. INSTALLATION

General Guidelines
• Select controller location so that it is shielded from direct sunlight, dripping water and excess vibrations.
• Select the acid-dosing injector point away from the sampling point to prevent acids from damaging
the probe or triggering an alarm.
• Keep flow rate as constant as possible for optimum sensor operation.
• Install cable gland fittings and plugs, to properly seal the pump controller.
• The probes are easily installed using 1/2" NPT threads for in-line or flow cell installation, and 3/4"
NPT thread for reservoir immersion installation.
• Ensure all tubing, cables, saddles and fittings are properly connected.
Note: HI981412 Groline pH controller is shipped with two types of tubing, for both flow cell and
in-line configurations:
- rigid tubing for outlet (dispensing) - connects the pump output to the injector
- flexible tubing for inlet (aspiration) - connects the filter to the pump inlet
Wiring Guidelines
Running cables through cable glands
• Unscrew the gland nut and remove the cap.
• Thread cable through outer opening of proper gland nut, through the seal, and into case.
• After connecting to terminal, reinsert seal and tighten nut on the threaded gland.
Connecting cables to the internal terminals
• Using a screwdriver, connect the cable leads to the appropriate terminal.
• Following the printed lead markings (L, PE, N for power supply; NO, COM, NC for relay; level sensor
if required) ensure the leads are wired to the correct position.
Installation Steps
1. Check the acid tank level.
2. Calibrate the pH probe before installing in the system.
3. Mount the probe into saddle or into a flow cell.
4. Connect the aspiration tubing between the chemical tank and the pump's inlet.
5. Connect the dispensing tubing between the pump and injector.
6. Check the level sensor's functionality (if used).
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