Hanna Instruments HI 903 - Manual (Page 31)

2-7
SETUP
Figure 1
2.3.4 Titrator Assembly
Note: Assembly operations must be completed before connecting the titrator to the power supply!
2.3.4.1 Connecting the Pumps
Dosing Pump:
The dosing pump is driven by a stepper motor, which provides 40,000 steps for a single
burette volume.
The pump housing also holds the motor, which automatically positions the valve for filling
and dispensing titrant. The dosing pump’s integrated sensors electronically recognize the
volume of any Clip-lock
TM exchangeable burette system syringe.
Connect the dosing pump with the following steps (see Figure 1.):
(1) Retrieve the pump cable (PUMP 1) from inside the left bay. Connect the cable to
the pump as shown in Figure 1. The pump connector is located in the lower part
of the pump, near the motor.
(2) Lower the pump into the titrator, then slide it towards the front of the titrator
chassis until it is firmly latched.
(3) Secure the pump with the locking screw.
Air Pump:
The diaphragm air pump system is designed to work with the specially designed bottle top
assemblies. It allows the solvent in the titration vessel to be removed and/or replaced without
opening the titration vessel and exposing the interior of the vessel to ambient moisture from
atmospheric humidity.