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HOLD Function
This feature helps to freeze the display for a delayed observation.
1. Press HOLD/ button to freeze
2. Press HOLD/ again to
the measurement.
release the measurement.
mV
mV
mV
RmV
RmV
hold
189
189
Press Hold
Press Hold
mV
to release
to release
189
25.0°C
25.0°C
25.0°C
Sensor Maintenance
1. Rinse the sensor with sensor storage solution after each measurement. Care
has to be taken not to damage the sensor's glass electrode.
2. In aggressive chemicals, dirty or viscous solutions, and solutions with
heavy metals or proteins, take readings quickly and rinse electrode
immediately afterward.
3. If possible, keep a small amount of clean water or electrode storage
solution (NOT de-ionized water) in sensor cap to keep sensor hydrated.
Sensor Replacement
Replace the sensor module at the fraction of the cost of a new tester.
When the tester fails to calibrate or gives fluctuating readings in calibration
standards, 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 sensor 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 sensor ring into place by firmly twisting
clockwise.
Note: It is necessary that you recalibrate the tester prior to measurement
after a sensor replacement.
1065O100_MAN_35634-45.indd 2
Replacing the Batteries
The pH tester 50 uses four AAA
1.5 V batteries.
1. To remove the battery cover,
See Figure 1. Clear the front
mV
catch and then the back
hold
catch, before sliding the
RmV
cover off.
189
25.0°C
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 plate, align
the small tabs (Figure 3) into
the guide ribs on the hous-
ing and then press down.
See Figure 4.
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 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.
Self-Diagnostic Messages
stable error
over range
under range
Fig. 1: Removing battery cover
Fig. 2: Push to unlock
Specifications
Specifications
ORP/RMV
Fig. 3: Align tabs
Fig. 4: Push down to lock
Temperature
General Specifications
Fig. 5: Battery plate unlocked
Fig. 6: Battery plate locked
Accessories
Ordering Code
Batteries are weak and need replacement soon.
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.
The reading is above the measuring range of tester.
The reading is below the measuring range of tester.
ORPTestr 50
ORP range
–1000 to 1000 mV
Resolution
±1 mV
Relative accuracy
±2 mV ±1 LSD
Calibration points
One
Calibration window
±200 mV
Calibration type
Offset
Temperature range
0 to 60°C / 32.0 to 140.0°F
Temperature resolution
0.1°C / 0.1°F
Temperature accuracy
NA
Temperature compensation
Manual
Temperature calibration window
0 to 60.0°C / 32.0 to 140.0°F
Display
Graphics, dot matrix 80 x100 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
>250 hours
Waterproofing
IP67
Regulatory certifications
CE, FCC
Ambient operating temperature
5 to 45°C / 41 to 113°F
Relative humidity
5% to 85% noncondensing
Storage temperature
–20 to 60°C
Storage humidity
5% to 85%, noncondensing
Product Description
35634-45
ORPTestr 50 pocket tester with case, lanyard, and batteries
35634-47
Replacement sensor module
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 pH testers
05478-60
YSI
Zobell solution
®
www.4oakton.com
1065O100_MAN_35634-45
August, 2017
9/5/2017 3:04:41 PM
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