On-line analyzer MFD88
The MFD88 is a device intended for fixed installation in the industry. It supports up to 12 measuring points in any combination of the measurement types offered. The outputs are provided through current loops, output relays and a digital interface, suitable both for connection with usual control systems and for direct control of smaller technologies.
Measurement locations are equipped with so-called input blocks located near the sensors. This allows a distance of up to 1000 m between the sensors and the device, without affecting the reliability of the measurement. A single unshielded two-core cable with the possibility of branching is sufficient to connect all the measured points. Housing for sensors and input blocks is provided by a wide variety of different probes, designed to suit sites of different nature. The device also supports automatic sensor cleaning, temperature correction and supplementary temperature measurement for each location.
Output interfaces include four industry standard 0-20 / 4-20 mA analog current loops with configurable ranges, up to 4 relays (expandable to 8 using current loops), as well as a MODBUS / RS485 digital interface. It is thus possible to directly connect to common current loop based configurations, to directly control technological elements (such as various dosing valves, etc.), or just as easily to transfer the entire set of measured values to the control system via a single digital interface.
Interaction with the user is easy thanks to the high-contrast dot-matrix LCD display, which is easy to read in the dark and in the sun, and a simple menu-based system controlled by only 6 buttons. Easy-to-open transparent door and optional access codes provide a good balance between convenient operation and protection against harsh environments and interventions of unauthorized persons. Semi-automatic calibration procedures are useful for regular maintenance of the measuring set-up.
The installation options are quite wide. Thanks to a wide range of permitted temperatures, a high level of protection, an alternative power supply of 230V AC or 24V DC, a large permitted length of cabling and overvoltage protection applied to all interfaces (against the secondary effects of lightning), there is no problem placing the device almost anywhere. An additional protective cover is available for outdoor use (the MUT13V clamp).
Advanced functions include freezing of outputs during calibrations or sensor cleaning, to prevent interference with technology control during measurement downtime, data logging available for later review or download, storage of calibration data in the input block located in the probe, allowing easy relocation of the probe for maintenance or other use without loss of calibration, as well as a number of options for direct control of the technology via relays or current loops, with limiting values control, time delay and other widely configurable logic, or using integrated PID controllers with convenient automated settings.
The order must include a list of the required measurements and additional components, so that appropriate probes equipped with the correct sensors and input blocks can be supplied, as well as the correct device configuration for the setup.
Oxygen and temperature measurement
MFD88 supports modern optical sensors of the INSA series CSOT53 and CSOT63, as well as classic sensors of the Clark type CSOT43 (better fitted for high values). INSA oxygen sensors always include temperature measurement.
pH value measurement
Classic glass sensors are used to measure pH. If temperature correction of the pH measurement is required, the system should include the TTK21 temperature sensor.
ORP measurement
The electrode for ORP measurement needs an appropriate reference electrode, which is usually integrated directly into the body of the sensor. As a rule, additional temperature measurement is not installed, because ORP measurement does not require any temperature correction.
Conductivity measurement
The MFD88 supports conductivity measurement using classic two-electrode sensors. Thanks to advanced technology, capacitive effects on the electrodes are eliminated, which makes the measured data accurate even at high conductivity values. With an installed temperature sensor TTK21, several preset profiles for temperature correction are available, or the appropriate linear coefficient can be entered. The output can also be converted to TDS or salinity values, either by a user-selected coefficient or by the PSS-78 method.
Chlorine measurement
CSUT43 or CSCT43 sensors may be used for chlorine measurement, providing sensitivity to different groups of chlorine compounds. The measurement is suitable for continuous monitoring and regulation of the chlorine concentration, but must be regularly calibrated (usually by the DPD method). pH and/or ORP measurements are often installed in the same device as needed.
Chlorine dioxide measurement
Chlorine dioxide measurement works with CSDT43 sensors. The measurement is suitable for continuous monitoring and regulation of the chlorine dioxide concentration, but must be regularly calibrated (usually by the DPD method). Where necessary, the same device may also process the measurements of pH or other quantities.
Ozone in water measurement
Ozone measurement in water works with CSZT43 sensors. The measurement is suitable for continuous monitoring and regulation of the ozone concentration, but must be regularly calibrated (usually by the DPD method). Where necessary, the same device may also process the measurements of pH or other quantities. Relay outputs are suitable for direct control of ozonizers.
Ion Selective Measurements (ISE)
The MFD88 device supports measurement with selected types of ion-selective electrodes (contact us if you are interested in other measurements). Each application of this type, including the measurement range, must be carefully assessed based on the characteristics of the individual sensors.
Automatic sensor cleaning
Automatic sensor cleaning may be used on a limited number of measuring points, if they are equipped with SPO41ME or SPR41ME probes and sensors suitable for automatic cleaning. The device controls the mechanisms of the individual probes, and freezes the respective values so that the output from the device is not affected by the ongoing cleaning process.
| Power supply | 230 V 50 Hz, or 24 V DC ± 20 % |
| Power consumption | max. 20 VA |
| Dimensions (cable glands not included) | 240 x 184 x 115 mm |
| Weight | ca 1.5 kg |
| Enclosure | IP 65 |
| Operating temperature | -20 to +50 °C, input block -20 to +70 °C |
| Relative humidity | 10 to 90 % |
| Analog outputs | 4x loops 0 - 20 or 4 - 20 mA, configurable transfer from measurement display |
| Analog outputs load | Passive, max. 500 Ω |
| Relays | 2x or 4x built-in relay (further relays 12V/20mA may be connected to analog outputs) |
| Contact rating (built-in relays) | max. 3 A at 230V/50Hz, max. 5 A at 24V DC |
| Temperature measurement range | -2 to +100 °C (also limited by installed sensor) |
| Temperature measurement accuracy | ± 0.2 °C |
| Oxygen measurement range (optical sensors CSOT53, CSOT63) | 0.1 - 20 mg/l or 1 - 150 % |
| Oxygen measurement range (Clark-type sensor CSOT43) | 0.1 - 30 mg/l or 1 - 300 % |
| Oxygen measurement accuracy | 1 % (of full range) |
| pH measurement range | 0 - 14 |
| pH measurement accuracy | 0,5 % (of full range) |
| Calibration pH | 3 points |
| ORP measurement range | -1000 to +1000 mV |
| ORP measurement accuracy | ± 0.5 mV |
| ORP measurement resolution | 0.05 mV |
| Conductivity measurement range | 30 µS/cm, 300 µS/cm, 3000 µS/cm, 30000 µS/cm, 30 mS/cm, 200 mS/cm (or up to 1000 mS/cm with special sensors) |
| Conductivity measurement accuracy | ± 2 % (of full range) |
| Temperature correction for conductivity measurement | Linear coefficient 0 - 10 %/°C or preset profiles |
| Conversion of conductivity to TDS or salinity | Coefficient 0.25 - 1.5 or the PSS-78 method |
| Chlorine measurement range | 0.01 to 3 mg/l |
| Chlorine measurement accuracy | ± 3 % (of full range, at constant temperature) |
| Chlorine dioxide measurement range | 0.01 to 2 mg/l |
| Chlorine dioxide measurement accuracy | ± 5 % (of full range, at constant temperature) |
| Ozone measurement range | 0.01 to 2 mg/l |
| Ozone measurement accuracy | ± 5 % (of full range, at constant temperature) |
| Supported ISE electrodes | NO3-, K+, Cl-, F-, Ca++, NH4+ (correction by K+ is available) |
| ISE measurement ranges | 0.001 to 30 mg/l, 0.01 to 300 mg/l, 0.1 to 3000 mg/l, or 1 to 30000 mg/l (depends on the installed sensor) |
| ISE resolution | 0.1 mV |
| ISE calibration | 3 points for each sensor type |
| Automatic cleaning | max. 4 measuring points |
| Automatic cleaning interval | Configurable from 1 min. to 24 hrs. |
- Downloads:
MFD88 dimensions- Installation template for MFD88
- MFD88 connections (with oxygen sensor CSOT53)
- MFD88 connections (with oxygen sensor CSOT63)
- MFD88 connections (pH measurement)
- MFD88 connections (ORP measurement)
- MFD88 connections (conductivity measurement)
- MFD88 connections (chlorine measurement)
- MFD88 connections (chlorine dioxide measurement)
- MFD88 connections (ozone measurement in water)