General Tools and Instruments WK2017SD - Manual (Page 12)

NORMAL OPERATION
The WK2017SD can operate in any of four measurement modes, selectable by pressing the
▼
button (which has the word “Function” stenciled above it). Pressing the button
repeatedly cycles through the modes and produces the following on-screen text:
• PH (for measuring the pH or ORP of a solution)
• Cd (for conductivity and TDS measurements)
• SALt (for measuring the salt content of a solution by weight)
• do (for dissolved oxygen measurements)
1. To select the measurement mode, press the ▼ button (which has the word
“Function” stenciled above it) repeatedly until the term for the desired measurement
mode appears.
2. To measure the pH of a solution, power on the meter and press the ▼ button until the
display shows the term “PH”. Obtain a pH electrode and seat it firmly in the BNC socket
(callout 1-16 of Fig. 1) on the top of the meter. If an ATC temperature probe is being
used, make sure it is seated firmly in its socket (callout 1-13 of Fig. 1) on the top of the
meter as well. If an ATC probe is not being used, perform Step 15 of the setup procedure
to manually match the compensation temperature to the temperature of the solution
being tested.
Following are the default states for the WK2017SD in pH measurement mode:
• The display shows “PH”
• Temperature unit of ºC
• Manual temperature compensation
• Auto power off
• Sampling time of 2 seconds
To change any of these parameters, use the specific procedure for it detailed earlier in the
Setup section.
To make the pH measurement, hold the pH electrode by its handle and immerse it in the
solution under test. (If you are using the ATC temperature probe, immerse its head in the
solution as well.) Gently shake the electrode (and probe, if used) to help any air bubbles
escape and to ensure an accurate reading. The display will simultaneously show the
solution’s pH in the center and either the manually selected compensation temperature or
the actual temperature of the solution (as measured by the ATC probe) below it. By default,
the temperature reading will be in ºC, unless ºF has been selected.
3. To measure the ORP of a solution, power on the meter and make sure that it is
operating in pH measurement mode. Then press the ▼ or ▲ button to make the display
show the term “mV”. Next, obtain an ORP electrode with a BNC connector and plug it
into the same socket on the top of the meter (callout 1-16 of Fig. 1) that accepts the plug
of a pH electrode. Holding the ORP electrode by its handle, immerse it in the solution
under test. Gently shake the head of the electrode) to help any air bubbles escape and
to ensure an accurate reading. The display will show the ORP of the solution, in mV.
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