INSTRUCTION MANUAL
MULTI-PARAMETER TESTR 35 SERIES
pH / Conductivity / TDS / Salinity / Temperature
Part of Thermo Fisher Scientific 68X441601 Rev. 1 March 2010
Thank you for selecting our Multi-Parameter Testr. This manual serves the following (3) models:
• PCTestr 35 (Eutech PCTEST35-01X441504 / Oakton 35425-00)
pH / Conductivity / Temperature
• PTTestr 35 (Eutech PCTEST35-01X441505 / Oakton 35425-05)
pH / Total Dissolved Solids / Temperature
• PCSTestr 35 (Eutech PCSTEST35-01X441506 / Oakton 35425-10)
pH / Conductivity / Total Dissolved Solids / Salinity / Temperature
Getting Started:
Your instrument has been factory calibrated and usually works well out of the box. However, after
extended periods of non-use, it’s best to remove the sensor cap and soak the
sensor (pictured here) in warm tap water or pH buffer for 10 minutes or so. A
brief rinse with deionized (DI) water is OK, but avoid soaking or storing in
deionized water as this will shorten the pH electrode life. Prior to taking
measurements, periodic calibration with certified standards is recommended for
best accuracy.
Your Testr begins in the measuring mode that was previously used. Just prior to measurement or
when switching modes, you will see the setting associated with each parameter i.e.) pH (buffer
group selected), Conductivity (Auto), TDS (factor), Salinity (unit of measure).
Setup:
Your Testr allows customization of various settings. To access the setup mode:
1. With the Testr off, keep the pressed down while you press and release .
(Setup) will appear, then as you release , (Parameter) will appear.
2. Press or to choose (Parameter Setup) or (System Setup)
menu.
3. Press to enter the selected setup menu.
*IMPORTANT*
It is necessary to save your Parameter and System
changes in order for them to take effect.
1. When you are finished making your desired changes, press both and at the same
time and keep them pressed until you see “SA” (Save) on the display.
2. With the primary display “SA” and secondary display “YES”, press to save the
changes. The instrument will resume measurement mode with new setting(s).
Note: If auto-shut off is used, changes will be automatically saved 8.5 minutes after the last
change was made.
Parameter Setup: Select to make changes relating to the
parameters – pH, Conductivity TDS, Salinity. Note: only the PCS Testr will have all of
these options. See below for menus available from each parameter. To Navigate the
menus:
Press to select or confirm the displayed option.
Press or to scroll thru options or change values.
pH Options:
USA or NIST Buffer Group for calibration buffer option.
5-pt calibration (all points) or 3-pt calibration (middle three points only).
Salinity (SALt) Option (PCS Testr only)
Choose PPt (parts per thousand) or Per (percentage %) as unit of measure.
Total Dissolved Solids (tDS) Option (PT and PCS Tester only)
FACt factor the instrument uses to convert from conductivity to TDS value.
Adjustable from 0.40 to 1.00 (default factor is 0.71).
Conductivity Options (PC and PCS Tester only)
A.Cal (Automatic Calibration) Choose YES or NO (manual).
TIP: The PC Testr 35 and PCS Testr 35 are capable of automatic or manual
conductivity calibration. In automatic calibration mode, the meter will automatically
choose one of (3) conductivity calibration standards depending on the ranges listed
below. If you will only use 84 µS, 1413 µS, or 12.88 mS calibration standards,
automatic calibration is a time saving option. If you intend to calibrate with one or more
standards that are not listed below, choose “NO” which will disable auto calibration and
allow you to enter your desired value manually.
Conductivity Range Automatic Calibration Value Available with
0.0 – 200.0 µS 84 µS PCS only
201 – 2000 µS 1413 µS PC or PCS
2.01 – 20.00 mS 12.88 mS PC or PCS
SPC (Single-Point Calibration) Choose YES or NO (multi-point calibration).
TIP: The PC Testr 35 and PCS Testr 35 are capable of single or multi-point conductivity
calibration. Use Single-Point Calibration to apply a single calibration value across all
ranges. Use Multi-Point Calibration for individual calibration in each range. This will
restrict an individual calibration so that it is applied to one range only. When using
multi-point calibration, perform a calibration in each range that you expect to use for
best results.
System Setup:
Select to make changes relating to the system. See below for available menus.
Note: other than changing Temperature units, it is advised to keep the factory default
settings for best results. To Navigate the System menus:
Press to select or confirm the displayed option.
Press or to scroll thru menu options or change values.
Unit rSt (Instrument reset)
PH (pH) or EC (electrical conductivity / TDS / Salinity)
CAL (calibration reset) or FCt (Reset to factory default settings)
Set A.Off (Automatic shut off after 8.5 minutes) Choose YES or NO.
Set t.C (Temperature Coefficient) 0.0-10.0% (2.1% is default)
Set AtC (Auto Temperature Compensation) Choose YES or NO (25°C is used).
Set °C °F (select temperature units) Choose °Celsius or °Fahrenheit.
Temperature Calibration:
The factory temperature calibration should last for the life of the original sensor since it
doesn’t normally drift. Temperature calibration is always recommended upon sensor
replacement. It may also be desirable to adjust the temperature to match a certified
accurate thermometer or another Testr. The temperature value is common to all
parameters so only one calibration is needed. To perform temperature calibration:
1. Press to turn on meter. Place the reference thermometer and your Testr
into the same sample. Allow enough time for both to stabilize.
2. Press as needed to select the pH measuring mode. Press to begin pH
calibration mode.
3. Press for 5 seconds to begin temperature calibration mode. The current
temperature will be displayed on top while the factory default temperature is
below.
4. Press or to manually adjust to the desired temperature—up to ± 5°
C or ± 9° F of the factory default value.
5. Press to confirm and return to the pH measuring mode.
pH Calibration:
For best results, calibrate with certified accurate pH calibration standards (buffers).
You may calibrate up to five points with the USA (1.68, 4.01, 7.00, 10.01, 12.45) or
the NIST (1.68, 4.01, 6.86, 9.18, 12.45) buffer group.
1. Press to turn meter on and to select pH mode as needed.
2. Rinse the sensor with clean water. Immerse the sensor into your pH buffer and
press . The primary display will show the un-calibrated pH value, while the
secondary display should search for and lock on the closest automatic calibration
value.
3. Allow the primary display to stabilize, then press to confirm the calibration
value. The primary value will blink briefly before the secondary value automatically
scrolls thru the remaining pH buffers available for calibration.
4. Repeat steps 2 & 3 with additional buffers or press to return to
measurement mode.
