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Portable pH-meter,
PH 25
This instrument is light, functional
and very robust.
It has been designed to work in
harsh conditions, both in industry
and in the field or lab.
Two instruments in one. Depending
on the sensor connected, it can be a
pH-meter or a thermometer.
Key features
Double-LCD display screen, for
simultaneous readings of pH, or
mV and temperature. With icons
indicating battery, calibration, unit,
etc. status.
Two instruments in one: a pHmeter and a thermometer. As a pHmeter it measures pH and °C and,
by replacing the pH electrode with
a temperature probe with a Pt 1000
sensor, it turns into a precision thermometer for up to 600°C.
The temperature probes which
can be connected to the PH 25 are
described on pages 44 and 98.
Automatic calibration with 1, 2
or 3 buffers, which can be pH 2.00,
4.01, 7.00, 9.21 and 10.90, values
at 25ºC.
Error messages for incorrect
calibrations.
The instrument automatically
switches itself off if no keys are
pressed for 5 minutes. This function
can be disabled by the user.
Uses very little electricity. With the
instrument on, the batteries will last
approximately 1000 hours.
IP 65 Protection. Dust- and waterproof.
Sensors connector (IP 67 protection)
for connecting pH electrodes with or
without an integrated temperature
sensor. Any Pt 1000 temperature
probe can also be connected to it.
“Long life” membrane keypad,
guaranteed for up to 6 million
strokes per key.
Optional carry-case, holds
everything you need to work in
comfort.
Advantages of the PH 25
• Very easy…
• Shock-resistant
• Ergonomic design
• Long-life batteries
• Industrial-use keypad
• Very competitively priced
Limitations
All portable instruments, even
watertight ones, are at risk from
condensation when exposed to low
temperatures.
This limitation disappears when
using CRISON lab or process pHmeters.
Certificates
Supplied with the EC Declaration
of Conformity as per directive
EMC 89/336/EC, and specifications
certificate.
For further information, please see
page 132.
Laboratory Catalogue 2004
1st Edition
11
Display examples
Keypad
The whole range of
functions can be
accessed using only
4 keys, both in
pH-meter and
thermometer
modes.
Simultaneous measurement of pH
and temperature.
pH
ºC
mV measurement
Operation
The PH 25 software is similar to that
of all other CRISON portables, and
has been designed to make the use
of this new range of instruments as
easy as possible.
Technical specifications
pH
mV
Measuring ranges
pH-meter.
-2.00...16.00 pH, ± 1500 mV and -20...150 ºC.
thermometer, -200... 600 ºC.
Resolution
pH-meter,
0.01 pH, 1 mV, 0.1 ºC.
thermometer, 0.1 ºC, -99.9… 199.9
1ºC, for the rest of the range.
Measuring error (± 1 digit)
pH-meter,
≤ 0.01 pH, ≤ 1 mV, ≤ 0.2ºC.
thermometer, ≤ 0.2ºC, -99.9… 199.9
≤ 1ºC, for the rest of the range.
Reproducibility (± 1 digit)
pH-meter,
± 0.01 pH, ± 1 mV, ± 0.1ºC.
thermometer, ± 0.1ºC, –99.9 … 199.9
± 1ºC, for the rest of the range.
Input impedance
> 1012 Ohm (Ω) The change from high to low impedance
is made int the electrode connector.
Autom. temperature compensation
By entering the temperature value using the keypad.
Using a temperature sensor.
pH calibration
With 1, 2 or 3 buffers chosen from the following values:
pH 2.00, 4.01, 7.00, 9.21 and 10.90 (at 25ºC).
Selection of theoretical calibration.
Display
Liquid crystal with pictograms.
Keypad
Membrane, 4 keys. Guaranteed for up to 6 million strokes
per key.
Material: PET with protective treatment
Sensors connector
MP-5, five-contact multipin.
IP 67 protection.
Power supply
Two 1.5V, type AA batteries, autonomy of over 1000 h.
Electrical safety
EN 61010-1, EN 61010-1/A2.
EMC (Electromagnetic compatibility)
Meets EC, EN 61326, EN 61326/A1.
Degree of protection
IP 65.
Permitted ambient conditions
Operating temperature 0... 50ºC.
Storage and transport temperature -15... 65ºC.
< 80 % relative humidity, non condensing.
Enclosure
Casing material: ABS.
Physical parameters
Weight 200 g, dimensions 160 x 75 x 50 mm.
mV
Instrument in calibration mode with
one, two or three buffers.
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Measuring as a thermometer
ºC
Low battery warning
Icon blinking
Specifications suject to change without notice
Ordering information
Code
Description
25 00
PH 25 without accessories
25 01
PH 25 with accessories, without electrode
25 02
PH 25 with accessories and carry case, without electrode
ACCESSORIES: Bottles of 125 ml of pH 4, pH 7 and pH 9 buffer solutions and small flasks for calibration.
ELECTRODES: The electrode must be requested separately for all versions of the PH 25. (See Pages 32-33).
TEMPERATURE PROBES: Described on pages 44 and 98.
Laboratory Catalogue 2004
1st Edition
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Portable PH 25 pH-meter,
connectable sensors
Fixed-wire cable
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pH electrode
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Platinum, redox, electrode
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Temperature probes
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Laboratory Catalogue 2004
1st Edition
Portable PH 25 pH-meter,
connectable sensors
13
With 90 93 adaptor cable
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pH electrodes, series 52 XX
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Metallic, redox, electrodes, series 52 XX
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With 90 97 adaptor cable with handle
pH electrodes, series 52 XX + ATC
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Laboratory Catalogue 2004
1st Edition
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