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V3.00/EN/00475446/2021-12-21
JUMO AQUIS 500 pH
Transmitter/Controller
for pH, ORP,
NH
3
(ammonia) concentration
and temperature
Brief description
The device is used for measuring/controlling the pH, ORP or NH
3
(ammonia) concentration. The
function is switchable on the device itself. Depending on the measured variable, combination
electrodes (e. g. pH/redox combination electrodes, gas-sensitive sensors) or split versions
(glass/metal electrodes with a separate reference electrode) can be readily connected.
Temperature serves as the second input variable, measured by a Pt100/1000, for example. It is
therefore possible to implement automatic temperature compensation for the pH and NH
3
variables.
The devices are operated using unambiguous keys and a large LC graphics display on which the
measurements are clearly legible. The plain-text presentation of the parameters makes it easier
for the user to configure the device, and also helps in programming it correctly.
Thanks to its modular design, the device can be perfectly matched to the specific application
requirements. Up to four outputs are available (see the block diagram for the functions).
Typical areas of application
Universal application in water and wastewater engineering, service/process water and
wastewater, drinking water and well/surface water, leakage monitoring in refrigeration plant
Key features
• Directly switchable to
pH, ORP or NH
3
(ammonia) concentration
��� Automatic temperature compensation
• Large LC graphics display with
background lighting
• Choice of display mode: large numbers,
bar graph or trend display
• Solder-free connection system
• Calibration options according to measured
variable:
1-/2-/3-point calibration
• Calibration logbook
• Impedance measurement can be activated
for pH measurement
• Symmetrical and asymmetrical connection
of pH sensors
• pH-ISFET sensors can be connected
thanks to the sensor supply integrated in
the output
• IP67 protection (in surface mountable
housing)
IP65 protection (for panel mounting)
• Language changeover:
German, English, French;
further languages can be loaded through
the setup program
• Using the setup program: user-friendly
programming, plant documentation,
additional languages can be loaded
Block diagram
Transmitter/controller
2 analog inputs
Input 1:
PH/ORP/
Ammonia concentration
1 binary input
For floating contact
Functions:
- key inhibit
- alarm stop
- HOLD
Supply voltage
110 — 240 V
12 — 24 V
AC
DC
20 — 30 V AC/DC
Analog outputs
Output 1 + 2:
0(4) — 20 mA or 0 — 10 V
option
Setup interface
Switching outputs
Output 3 + 4:
- relay, changeover (SPDT)
Supply voltage
For ISFET sensor
User-friendly configuration
Reloading of languages
Plant documentation
Configurable as
- analog process value output
- continuous controller output
(PID action)
Configurable as
- limit controller
- pulse width output
(PID action)
- pulse frequency output
(PID action)
- modulating controller
(PID action)
as standard
Input 2:
Temperature
manual entry or automatic
Pt100 / Pt1000 / 4 kΩ
Data Sheet 202560
Type 202560
Approvals
20256000T10Z002K000
V3.00/EN/00475446/2021-12-21
Data Sheet 202560 Page 2/12
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Display modes
Three display modes are available:
Large digits
In this display mode, the measurements are,
as usual, shown in digits.
Trend display
The numerical value is supplemented by a
symbol which indicates the change direction
and change speed of the measurement.
This can, for instance, be very useful during
controller tuning.
from left to right:
fast, medium and slow rise, stable,
slow, medium and fast drop.
Bar graph
This display mode allows the user to see at a
glance in which region the measurement is at
present.
The bar graph can be freely scaled.
pH measurement
Both combination pH electrodes and glass
electrodes with a separate reference electrode
can be connected. There are two ways of
connecting the electrodes:
• asymmetrical, high-impedance
(this is usual way)
• symmetrical, high-impedance
(in special cases)
What is new is the possibility of monitoring the
impedance of the connected electrode(s).
Thanks to this feature, the glass and reference
impedances can be acquired individually
(when used with a separate ground pin), or as
a cumulative value.
Special electrodes, which use antimony as the
pH-sensitive element, can also be connected.
A supply for ISFET sensors has been
integrated. This enables the user to operate
suitable sensors directly.
Functional description
The device is designed for use on site. A
rugged housing protects the electronics and
the electrical connections from corrosive
environmental conditions (IP67). As an
alternative, the device can also be installed in
a control panel; it is then protected to IP65 at
the front. The electrical connection is made by
easy-to-fit pluggable screw terminals.
Displays and controls
(1)Switching output 1 or 2 is active
(2)Binary input 1 has been actuated
(3)Keypad is inhibited
(4)Alarm has been activated
(5)device is in manual mode
(6)device status
(7)Temperature of medium
(8)Principal measurement
(9)Unit of principal measurement
The user can define what is to be shown in
positions (7) and (8) of the display:
•No display
• Compensated measurement
• Temperature
• Output level 1
• Output level 2
• Setpoint 1
• Setpoint 2
Operation
For easy programming and operation, all
parameters are arranged in clearly structured
levels and shown in plain text. Operation is
protected by a code word. This facilitates
individual adaptation of the operation, since
parameters can be generally enabled or
assigned to the protected area.
As an highly convenient alternative to
configuration from the keys, the device can
also be configured through the setup program
for PC (option).
(1) (2)
(4)
(5)
(6) (7)
(8)
(9)
(3)
ISFET sensors are employed for special
applications where glass sensors are not
required (glass-free pH measurement).
However, because these sensors are not
standardized, it is necessary to check their
usability before application.
The pH is temperature-compensated through
automatic temperature measurement, by
means of the second input, or by entering the
value manually.
ORP measurement
Combination redox electrodes as well as
metal electrodes with a separate reference
electrode can be connected.
The value is displayed in mV, or is freely
scalable.
Ammonia measurement
After the transmitter/controller has been
configured for NH
3
(ammonia) measurement,
the appropriate sensors can be connected.
Applications:
Leakage monitoring of cooling circuits
Calibration
pH measurement
• 1-point calibration
• 2-point calibration
• 3-point calibration
ORP measurement
• 1-point calibration
• with display in mV
• 2-point calibration
with display in % (freely scalable)
NH
3
(ammonia) measurement
• 1-point calibration (zero of electrode)
Calibration logbook
The five most recent calibrations performed
successfully can be called up in the calibration
logbook. This makes it possible to evaluate
the ageing of the sensor that is connected.
If required, the logbook can also be deleted
(this makes sense when changing the sensor).
Calibration timer
The calibration timer indicates (if required)
when the next routine calibration is due. The
calibration timer is activated by entering a
number of days, after which recalibration has
to be carried out (plant or operator
requirement).
Min/Max value
memory
This memory acquires the minimum (bottom)
or maximum (peak) input variables that have
occurred. This information serves, for
example, to decide whether the sensor that is
connected is designed for the values that are
actually present.