user manual

Input Calibration

154 UDA2182 Universal Dual Analyzer Product Manual January 2009

8.6.3 ORP Calibration Using Voltage Input

Calibrates Analyzer only

The procedure described in this sub-section calibrates the Analyzer only. It does not

involve compensating for electrode drift. Instead, a known millivolt signal is applied to

the analyzer input terminals in place of the signal from the electrode, and the UDA2182 is

adjusted so that its reading matches the known input.

ATTENTION

This procedure can only be used when measuring ORP only

Materials

The materials required to calibrate the Analyzer using a voltage input are:

• A source of a known millivolt signal.

• A screwdriver to fit the Analyzer input terminal screws and the terminal retainer.

Procedure

Make sure you have selected “PV Type –ORP” in the Inputs configuration – Table 6-5.

Refer to Section 6.4.1 –

General Rules for Editing.

To calibrate the ORP Analyzer using Voltage Input, follow the instructions in Table 8-7.

WARNING

This procedure should be performed by qualified personnel only. Disconnect the power

before opening the instrument case. A potentially lethal shock hazard exists inside the case if

the unit is opened while powered. More than one switch may be required to disconnect power.

Table 8-7 Procedure for Calibrating ORP Analyzer Using Voltage Input

Step Action Screen

Turn off the power to the Analyzer. More than one switch may be

required to disconnect power.

With the power off open the case:

Loosen the four captive screws on the front of the bezel.

Grasp the bezel on the right side. Lift the bezel gently and swing

the bezel open to the left. (The bezel and display assembly is

mounted on pivot arms.)

Refer to Figure 7-1 for the location of the terminal board retainer.

Loose the screws that hold the retainer and slide the retainer right

or left until the retainer tabs disengage from the terminal boards.