Hach EC1000, Instruction Manual

Page: 71 / 128

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SECTION 6 BASIC START-UP
Note: This section is not used for the Industrial pH Electrode (Cat. No. 48276-00).
6.1 Introduction
In the following sections the various preliminary tasks necessary to make the Process
pH/ORP System operational are defined in their recommended sequence. Once these
preliminary steps are performed, and the controller is programmed to the desired settings,
the system is ready for operation. The same procedure can be applied to ORP installations.
6.2 Adding Electrolyte
Process pH reference electrolyte (Cat. No. 24291-49 or 24291-17) is recommended for use
with the Hach Process pH Electrode and the Hach One Process ORP Electrode. One bottle
(500 mL) of electrolyte lasts over one month. The electrolyte timer gives a warning of low
electrolyte 30 days after the timer is set. See Section 2.2.7 Reference Solution Timer for
setting the timer for operation.
6.2.1 Assembling the Electrolyte Line
Use the entire length of Teflon tubing supplied with the system for best performance.
Excess tubing should be coiled up. Prepare the Teflon tubing as follows:
1. Make a square cut at the two tubing ends, using a razor or cutter blade. DO NOT use
scissors or cutting pliers that cause a permanent loss of shape of the tubing end.
2. Thread the Teflon tubing through a rigid conduit for better tubing protection.
6.2.2 Connection to the Pump Module
1. Thread the Teflon tubing into the pump module through the strain relief bushing
supplied in the pump module installation kit. See Figure 26 on page 89.
2. Loosen the four plate screws over the pump face and remove the plate.
3. Install the pump tubing assembly in the pump (with 3-way stopcock underneath the
pump) and reinstall the pump plate by tightening the four screws by small steps to
obtain an even tension. The screws should be hand tightened, do not use a tool to
tighten. Make sure the pump tubing is correctly aligned in the center of the pump.
4. Connect the electrolyte reservoir tubing on the fitting at the top of the pump tubing.
5. Fully unscrew the male fitting of the connector under the 3-way stopcock
(Priming Tee).
6. Thread the Teflon tubing into the male fitting under the 3-way stopcock. Next, thread
the Teflon tubing into the ferrule with the cone pointing to the male fitting (refer to the
instruction card supplied by the vendor for the ferrule).
7. Push the Teflon tubing with the ferrule completely in the female fitting under the
3-way stopcock. Screw on the male fitting and tighten by hand only.
6.2.3 Connection to the pH Electrode
Note: Make sure to thread
the electrolyte tubing into
the part of the mounting kit
that is to be placed above
the electrode arrest ring
(collar and O-ring for
the immersion kit or
compression fitting for
the in-line kit).
1. Using the second ferrule and male compression fitting supplied in the installation kit,
prepare the second Teflon tubing end in the same manner used in Section 6.2.2
Connection to the Pump Module, Steps 6 and 7.
2. Unscrew and remove the protective plug on the pH electrode head. Push the Teflon
tubing with ferrule into the electrode head. Screw on the compression fitting and
tighten by hand only (see Figure 25 on page 85).