Batteries are weak and need replacement soon.
stable error
Appears when calibration is attempted but the reading
is not yet stable. Wait for the reading to stabilize or
manually confirm the calibration by pressing enter.
buffer error The buffer is outside of the calibration range.
slope error The 2nd and 3rd calibration point is not within 80% to
120% slope range.
over range The reading is above the measuring range of tester.
under range The reading is below the measuring range of tester.
Self-Diagnostic Messages
Replacing the Batteries
The PCTSTestr 50 Pocket Tester uses four AAA 1.5 V batteries.
1. To remove the battery
cover, see Figure 1.
Clear the front catch
and then the back
catch, before sliding
the cover off.
2. To remove the battery
plate, push the center
tab towards the front
of the tester as shown
in Figure 2. Once
unlocked, remove the
plate to access the
batteries.
3. Invert the tester
upside down to
remove the batteries.
Each side uses two
AAA batteries. Orient
each battery with
positive terminal facing
downward.
4. To lock the battery
place, align the small
tabs (Figure 3) into the
guide ribs on the hous-
ing and then press
down. See Figure 4.
Fig. 3: Align tabs
Fig. 4: Push down to lock
Fig. 5: Battery plate unlocked
Fig. 6: Battery plate locked
Fig. 2: Push to unlock
Fig. 1: Removing battery cover
User Reset
Factory
Reset
Yes
No
Measure
Settings
Temp Set
hold
menu
hold
Reset
hold
1. Press HOLD/
button to
freeze the measurement.
2. Press HOLD/
again to
release the measurement.
hold
hold
COND
µs/cm
820
23.5°C
Press Hold
to release
COND
µs/cm
820
23.5°C
7
8
9
1065O100_MAN_35634-35
August, 2017
Ordering
Code
Product Description
35634-35
PCTSTestr 50 pocket tester with case, lanyard,
and batteries
35634-37
Replacement sensor module for PCTSTestr 50
35634-09
Replacement sensor cap
09376-00
Replacement alkaline batteries; AAA, 1.5 V.
Pack of 12
17101-45
NIST-traceable calibration with data for pocket testers
Accessories
Specifications
PCTSTestr 50
pH
pH range
–1.00 to 15.00 pH
Resolution
0.01 pH
Relative accuracy
±0.01 pH
Calibration points
Up to 3 points
Buffer set standard
selection
USA: 4.01/7.00/10.01
NIST: 4.01/6.86/9.18
Calibration window
±1.00 pH
Calibration type
Point to point
Conductivity
Conductivity range
0.0 to 200.0 μS, 200 to 2000 μS,
2.00 to 20.00 mS
Resolution
0.1 μS, 1 μS, 0.01 mS
Relative accuracy
±1% full scale
Normalization temperature 25.0ºC (77ºF)
Temperature co-efficient
0.0% to 10.0%
Calibration points
Up to 3 points
TDS
TDS range
0.0 to 100.0 ppm, 100 to 1000 ppm,
0.10 to 10.00 ppt (TDS factor 0.5)
Resolution
0.1 ppm, 1 ppm, 0.01 ppt
Relative accuracy
±1% full scale
Calibration points
Up to 3 points
TDS factor
0.40 to 1.00 (selectable)
Salinity
Salinity range
0.00 to 10.00 ppt
Resolution
0.10 ppt
Relative accuracy
±1% full scale
Calibration points
1
www.4oakton.com
Specifications (cont.)
PCTSTestr 50
Temperature
Temperature range
0 to 60°C (32.0 to 140.0°F)
Temperature resolution
0.1°C / 0.1°F
Temperature accuracy
From 0 to 50ºC (±0.5°C / ±0.9°F + 1 LSD);
from 50 to 60°C (±1.0ºC / ±1.8°F + 1 LSD)
Temperature
compensation
Yes (Automatic Temperature
Compensation)
General
Display
Graphics, dot matrix 80 x 100 pixel
Backlight
Yes, selectable
(30 sec from last key press)
Auto off
8.5 minutes (from last key press)
Reset
User / Factory
Power requirement
Four AAA 1.5 V batteries
Battery life
>150 hours
Water proofing
IP67
Regulatory
certifications
CE, FCC
Environmental Operating Conditions
Ambient operating
temperature
5 to 45°C / 41 to 113°F
Relative humidity
5% to 85% noncondensing
Storage temperature
–20 to 60°C / –4 to 140°F
Storage humidity
5% to 85% noncondensing
10
11
Factory Reset
Reset to the Factory Default Settings by using the Factory
Reset function.
1. Press MENU/
v
to enter setup window. Scroll down by
pressing MENU/
v
to select Reset. Press HOLD/
to select
Reset. The display shows User Reset and Factory Reset.
2. Scroll down by pressing MENU/
v
to toggle between the
resets. Press HOLD/
to select Factory Reset.
3. The display automatically shows No and Yes. Scroll down
by pressing MENU/
v
to toggle between No and Yes.
4. Press HOLD/
to confirm either No or Yes. The display
shows the Factory Reset option with a .
HOLD Function
This feature lets you freeze the display for a delayed
observation.
Sensor Maintenance
1. Always keep the sensor electrodes clean. Rinse the
electrodes with de-ionized water and wipe them dry with
clean cloth before storing with its protective cap. For cup
type electrodes, remove the white plastic cup and insert
to thoroughly clean viscous solutions. Note: Never scratch
electrodes with a hard substance.
2. For better performance, soak the electrode in alcohol for
10 to 15 minutes and rinse with de-ionized water before
starting any measurement process. This is to remove dirt
and oil stains on the electrode, which may affect the
accuracy of the measurements.
Sensor Replacement
You can replace the sensor module at a fraction of the cost
of a new tester. When the tester fails to calibrate or gives
fluctuating readings in calibration standards, you need to
change the electrode.
1. With dry hands, grip the ring with sensor facing you.
Twist the ring counterclockwise. Save the ring for later use.
2. Pull the old sensor module away from the tester.
3. Align the four tabs on the new module so that they
match the four slots on the tester.
4. Gently push the module onto the slots to sit it in position.
Push the smaller O-ring fully onto the new sensor
module. Push the other O-ring over the module and
thread it into place by firmly twisting clockwise.
Note:
It is necessary that you recalibrate your tester prior
to measurement after a sensor replacement.
Warranty
This instrument is supplied with a warranty against
manufacturing defects for a period of one year from the
date of purchase.
Return of Items
Authorization must be obtained from your distributor
before returning items for any reason. When applying for
authorization, please include information regarding the
reason the item(s) are to be returned.
We reserve the right to make improvements in design,
construction and appearance of products without notice.
Prices are subject to change without notice.
Specifications
Key Info
Scroll
Accept
EXIT
MENU
HOLD
CAL
Press Hold
to release
COND
µs/cm
820
23.5°C
COND
µs/cm
820
23.5°C
1065O100_MAN_35634-35.indd 2
9/5/2017 3:09:48 PM
