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6-Channel Monitoring System:
3 x Dissolved Oxygen,
3 x pH / ORP / Ion Concentration and
6 x Temperature Channels |
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6-Channel Monitoring System:
4 x Dissolved Oxygen,
2 x pH / ORP / Ion Concentration and
1 x Temperature Channels |
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6-Channel Monitoring System:
6 x pH / ORP / Ion Concentration and
6 x Temperature Channels |
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6-Channel Monitoring System:
6 x Dissolved Oxygen and
6 x Temperature Channels |
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10-Channel Monitoring System:
8 x pH /ORP / Ion Concentration,
2 x Conductivity and
2 x Temperature Channels |
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12-Channel Monitoring System:
12 x pH / ORP / Ion Concentration Channels |
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12-Channel Monitoring System:
12 x Dissolved Oxygen and
12 x Temperature Channels |
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12-Channel Monitoring System:
6 x Dissolved Oxygen,
6 x pH / ORP / Ion Concentration and
6 x Temperature Channels |
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12-Channel Monitoring System:
12 x pH / ORP / Ion Concentration and
12 x Temperature Channels,
with Galvanic Isolation between the Channels |
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16-Channel Monitoring System:
16 x pH /ORP / Ion Concentration and
4 x Temperature Channels |
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24-Channel Monitoring System:
24 x pH /ORP / Ion Concentration Channels |
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48-Channel Monitoring System:
36 x pH /ORP / Ion Concentration,
12 x Conductivity and
1 x Temperature Channels |
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24-Channel Modular Monitoring System:
24 x pH /ORP / Ion Concentration |
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| Software Features |
- Calibration and Monitoring software running on Windows (TM of Microsoft Inc) platforms Win 2000 / ME / XP / Vista / Win7
- The software is specific to the type of Multi-channel instrument.
- The software displays the data output for pH, ORP, Ion concentration, Dissolved Oxygen, Conductivity and Temperature.
- Number of used channels can be selected.
- pH / ORP / various Ions can be selected.
- Time between measurement cycles selectable from 2 sec to 60 sec in 1 sec steps and 1 min to 60 min in 1 min steps
- Time limit for the duration of the measurement can be set.
- Filter Grade (gliding average) can be set.
- The data are acquired, stored and displayed on-line in table-form.
- Tabular Display of mV, pH and Temperature, ATC on/off.
- Parameter values are displayed in mV, ppm, mol/L and °C units.
- The table includes the time and date of each measurement cycle.
- The stored data are in text format with Tab and LF separation and can be exported to Excel or other software packages.
- 2 to 6 point calibration for pH and Ions.
- Single channel and multi-channel calibration.
- Calculation of pH value and ion-concentration based on this calibration.
- Automatic Temperature compensation can be enabled and disabled for each channel separately.
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Applications |
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Screenshot of a 12-Channel pH Monitoring System
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Screenshot of the first 4-Channel of a 24-Channel Monitoring System for pH / ORP / Ions / Temperature
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Screenshot of the Excel Printout of a 24-Channel Monitoring System for pH / ORP / Ions / Temperature
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| Description |
- Continuous, Real-time Monitoring and Sample Measuring of:
pH, ORP, Ion Concentration, Dissolved Oxygen, Conductivity, Salinity, TDS and Temperature in Multiple Vessels in Various and Multiple Parameter combinations.
- Very Compact, very Cost-effective Solution.
- Replaces Data Acquisition using multiple Transmitters
- Connects to a Host Computer or Automation System (PLC) via Serial Communication (RS232, RS485, USB).
- Simple, transparent Communication Protocol enables the customer to write his own Software: e.g. by using LabVIEW, Daisy Lab, C++, Visual Basic, etc.
- For MS Windows based operating systems we offer Software (see Screenshots), which enables the user to Calibrate, Display and Store the Sensor Signals and the resulting Parameter Values.
- The Data Acquisition Rate can be selected over a wide range.
Display of Date and Time for each Measurement.
- The Data are stored in Text form and can be viewed, edited or exported to Excel or any other Software.
- Systems available for 6, 8, 12, 18, 24 and more Channels.
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| Features Top |
- The inner Modular Structure of the System enables us to Tailor an affordable Solution to the customer's needs.
- Full Flexibility in selecting the Number of Sensors with specified Parameters.
- Delivery Time 3 to 6 weeks
- Country-specific Mains Power Adapter is supplied.
- The simple, transparent Communication Protocol makes it easy for the user to write their own Software for processing the measurement data.
- Easy Connection of Sensors to the Front Panel.
- High-quality Sensor-Amplifiers allow the use of
most of the available Sensor types and makes.
- Galvanic Isolation between the Ground for the Sensor Amplifiers, Power Supply and Serial Communication.
- Versions with Galvanic Isolation between the Sensor Channels available to eliminate Ground Loops.
- For distances greater than 5 m between the Sensors and the System we suggest the use our long-life, battery-powered Sensor Pre-Amplifiers.
- Software compatible with Windows 2000 / ME / XP/ Vista and Win7.
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| Hardware Specification |
- Dimensions & Weight:
Depending on the type of the Instrument
Dimensions: Length- 300 mm, Width- 200 mm or 260 mm
and Height- From 60 mm to 150 mm
Weight: 1.5 kg to 3 kg
- Enclosure Material: ABS.
- Protection Class: IP62 / NEMA2.
- Power Supply:
12 V DC stabilized, 300-1200 mA depending upon the number of channels.
Connector: DC Power socket, 2.1 mm, Centre is positive.
Each instrument comes with a country specific Mains Adaptor.
- Connection to the Computer:
Serial Data Transmission RS232: 9600 baud, no parity, 8 data bits, 1 stop bit. Optional RS 485 or USB data transmission provided.
A standard 2 m long, serial data cable to connect the system to a PC serial port (COM 1 or 2, RS232) is provided.
Optionally RS232 to USB Converter is also provided.
- Sensor Connections:
All Sensor Connectors are arranged on the Front Panel of the instruments for easy access:
BNC sockets for pH-, ORP- and Ion-selective Electrodes.
2 mm Banana sockets for external Reference Electrodes.
4-way Mini-DIN sockets for Dissolved Oxygen Sensors (with or without built-in Temperature Sensor).
6-way DIN sockets for Conductivity Cell (2-Electrode cells).
Isolated 3.5 mm sockets (Mono-Audio) for Temperature Sensors.
- Sensor Amplifiers:
pH-, ORP-, and Ion Selective Electrodes: The Amplifiers for pH-, ORP-, and Ion Selective Electrodes are high quality Electrometer amplifiers with:
Input Resistance higher than 1 Terra Ohm (1012 Ohm). Input Bias Current less than 0.1 pico Amperes (10-13 Amperes).
D.O.: For Dissolved Oxygen measurements, please tell us the type of the Sensors being used. We can supply Amplifiers from 10 nA 100 µA, for Galvanic or Polarographic Sensors.
Conductivity: For Conductivity and Salinity Measurement we supply a Measuring System which uses low-frequency (100Hz) alternating current.
The Current average is always zero, no polarisation can occur.
The Current adjusts continuously to the actual Conductivity value of the sample. Currents and Voltages are measured, so that for any Conductivity value a good Sensitivity is achieved.
Temperature: We can supply Temperature Amplifiers for Thermistor Temperature Sensors (NTC), for Pt1000 and Pt100 Temperature Sensors.
- Sensors:
pH: Accepts all types including pH Electrodes with built-in Temperature sensor (Pt1000) or pH Electrodes with separate PT1000 Temperature sensors and pH Microelectrodes.
ORP: Accepts practically all types of ORP Electrodes.
ISE: Accepts practically all types of Ion-selective Electrodes.
D.O.: Accepts Galvanic and Polarographic Dissolved Oxygen Sensors. Please specify the Type and Make of the preferred sensor.
Conductivity: Accepts 2-Electrode Conductivity Cells with K=0.1, K=1, and K=10 Cell constants.
Temperature: Accepts Temperature Sensor with PT1000 or Thermistor sensor element.
- Measuring Range, Resolution and Accuracy:
pH:
Range: 0.00 to 14.00.
Resolution: 0.01 pH unit
Accuracy: 0.01 pH unit
ORP:
Standard Range: -1000 to +1000 mV.
Ranges upto -3,000 to +3,000 mV are available on request
Resolution: 0.1 mV.
Accuracy: ±0.3 mV (0.03% of full range)
For Ion-selective Measurements the Range, Resolution and Accuracy depends on the type of the Electrode (the type of the ion that is to be measured) and Calibration.
For Dissolved Oxygen Measurements the Range, Resolution and Accuracy depends on the type of the D.O. Sensor type.
For Conductivity and Salinity Measurements
the Range is from:
1 µS to 500 µS with Cell constant of K=0.1.
10 µS to 5 mS with Cell constant of K=1.
100 µS to 50 mS with Cell constant of K=10
Our system uses 2-electrode Conductivity Cells.
The Resolution is approximately 0.5% of the measured value.depending on the range.
The Accuracy is highest near the calibration point, about 0.5%. Therefore a calibration close to the expected sample value is recommended.
Temperature:
Range: 0 to 100°C
Resolution: 0.1°C
Accuracy: ±0.2°C in the range of 10°C to 70°C
±0.5°C in the range of 0°C to 100°C
Our NTC Temperature sensors can be exchanged without re-calibration. Automatic Temperature Compensation can be activated when Temperature sensors are connected.
- Galvanic Isolation:
The Sensor Amplifiers are fully galvanically isolated from Power Supply and the Data Transmission to the Computer.
Versions are available where the Channels are galvanically isolated from each other to avoid interferences and ground loops.
If a Channel-to-Channel isolation is necessary, then it will depend on the measuring configuration.
In cases where the measurements are performed in separate glass or plastic vessels a Channel-to-Channel isolation is required.
We can advise you for the optimal solution regarding cost-effectiveness and accuracy of measurement.
- Distributed Measurements:
If the distance between the sensors is more than 5 m (max upto 100 m), it makes sense to place small battery-powered (3 years battery life) Sensor Pre-Amplifiers close to the measuring points. This increases the accuracy of the measurements and allows to use cost-effectve sensors with standard cable length of 1 m. You will find these Amplifiers in Transmitters section.
- Measurement and Sampling Rates:
The system does not allow fast measurements. The conversion time of the integrating A/D converter for one channel is 100 ms (Milli seconds).
The channels are measured sequentially.
For a 12-channel monitoring system without temperature measurement the shortest cycle time is 2 seconds.
For a 12-channel monitoring system with temperature measurement the shortest cycle time is 3 seconds.
For special fast measurements it is recommended to use our single-channel or multi-channel Electrode Amplifiers with Analogue Output, which can be connected to fast Data Acquisition Systems. The researcher can then tailor the system exactly to his requirements and find the right compromise between speed and noise.
- Measurements with High Sample Rate:
There are 2 reasons why the measuring frequency is limited:
- For precise measurements it is necessary that an electrochemical equilibrium is established in the sample, the indicator electrode and the reference electrode.
- Some of the electrochemical measurements (especially pH) involve very high impedance (upto 1000 mega ohms) sensors. An integrating Analogue-to-Digital conversion eliminates electrical interferences (Signal-Noise).
An Analogue-to-Digital Conversion Time of 100 ms per channel is suitable.
This means for 6 channels, a sample rate of 1 full measurement cycle per second (including some spare time) is achievable.
With suitable software (Microsoft Excel) a 1 to 10 interpolation delivers good results for 100 ms time-slices.
If for special research projects (e.g. study of electrochemical interfaces) a higher sample rate is required, please use our Amplfiers and available fast Data Acquisition Systems (e.g. from National Instruments).These Systems are made to reduce the problems which can occur with high sample rates.
- Conformance Marking and Safety:
The system is CE and WEEE marked and fulfils all standard safety (not medical) regulations.
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