Operation, 2 calibration – KROHNE OPTISENS ORP 8590 EN User Manual

Page 18

OPERATION

OPTISENS ORP 8590

www.krohne.com

01/2014 - 4001933801 MA OPTISENS ORP 8590 R01 en

4.2 Calibration

4.2.1 Calibrating ORP measurement

The potential of an ORP electrode is calibrated using a ORP buffer solution. In the course of that,
the difference between the measured potential and the potential of the calibration solution is
determined. This potential difference is printed on the buffer solution bottle and is defined as the
voltage across the ORP electrode and a reference electrode. ORP sensors require no calibration,
but you can perform a one-point calibration with an ORP buffer solution.

To avoid alarms on the distributed control system (DCS) when temporarily removing the sensor
(i.e. for maintenance), the signal converter has a hold function. This function "freezes" all
outputs (i.e. the display and the current outputs) of the last measured value.

Measuring
mode

Main menu

Submenu

Parameter

3 or 4

pages,

scrolling

with ↓ or ↑

> 2.5 s

C setup

C3 I/O

C3.1 hardware

For further

information

see function

tables.

C3.2 current output A

C3.3 current output B

C3.4 current output C

C5 device

C5.1 device info

C5.2 display

C5.3 1.meas.page

C5.4 2.meas.page

C5.5 graphic page

C5.6 special functions

C5.7 units

↓↑

D service:

D service: This menu is password protected and contains functions to be used by service personnel only.

INFORMATION!
Remove the watering cap before starting the calibration.

CAUTION!
•

Never touch or scratch the platinum measuring tip of the ORP sensor.

•

Make sure that the glass tip is clean and dust-free. If necessary, clean the tip as described on
page 23

CAUTION!
Moisture inside the sensor connector must be avoided! Moisture may cause a shortcut and
deliver erratic readings!
If moisture has entered the connector, dry it with air (e.g. hair blower).

INFORMATION!
As an indication that the manual hold function is active, the "warning sign" in the upper left
corner of the display appears. Meanwhile the status messages show "checks in progress". For
more details about how to select the manual hold function refer to the signal converter manual.

.book Page 18 Friday, January 24, 2014 11:29 AM