Multi-parameter Instruments: Portable instrument MFD80
The MFD80 is a compact measuring device, suitable for use in the laboratory as well as for operative measurements in the field or industrial technologies. The device can measure up to three quantities simultaneously, as well as solution temperature and air pressure. A number of additional functions, data interfaces and the possibility of operation from the mains or from batteries predetermine the MFD80 for a wide range of applications.
Operation of the device 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. Several levels of password protection protect the device against unwanted changes to the settings, or against unwanted interventions by less qualified operators or unauthorized persons. Semi-automatic calibration procedures greatly facilitate the preparation for measurements.
The MFD80 is suitable for a wide range of applications thanks to its small size and weight, high degree of protection and support for rechargeable and classic batteries or mains adapter. In the field, the device and sensors are best protected by the recommended transport cover, which also protects against water immersion and drop damage (to some extent). In the laboratory, the device is best supported by the recommended stand, which also provides power and recharges the batteries of the inserted MFD80 device.
Data logging is an additional function that records measured data in the device for later processing. The device is also equipped with a clock, providing time stamps for all recorded data. The resulting record can be viewed on the device's display or transferred to a computer, tablet or phone via USB or Bluetooth in several possible formats. The MFD80 is compatible with the basic configuration of common operating systems, without the need to install any drivers, applications, etc.
Oxygen concentration measurement
The MFD80 device supports modern optical oxygen sensors CSOT53L, but also classic sensors of the Clark type CSOT43L. Optical sensors are characterized by greater endurance and long life of the membrane, zero consumption of oxygen during measurement and minimal maintenance requirements (virtually no need for recalibration).
To measure high oxygen concentrations, or when the fastest possible response of the sensor is required, the classic sensor of the Clark type CSOT43L may be more suitable. Even these sensors are characterized by a very low oxygen consumption, allowing for measurements in still water. Thanks to the advanced design of INSA instruments, there is also no need to wait for the polarization of the sensor, which is maintained even when the device is switched off. The MFD80 supports separate calibration for each type of sensor, so both sensors may be interchanged at will without the need for recalibration.
The measured data may be displayed as concentration (mg/l) or as percentual saturation, with correction according to the current atmospheric pressure. All INSA oxygen sensors are also equipped with temperature measurement and automatic temperature correction.
pH and ORP measurements
Classic glass sensors with an integrated reference electrode are used for pH measurement. The MFD80 supports three-point calibration, with the option to pre-set the values of the calibration solutions (buffers) in use, and automatically correct them for temperature during calibration.
ORP can also be measured through the same input of the device if a corresponding sensor is connected. Separately stored calibration enables alternating measurements of both quantities (only one at a time).
Ion Selective Measurements (ISE)
The MFD80 also supports selected types of ion selective electrodes, using the same input as for pH and ORP sensors. Only one variable from this group can be measured at a time, but thanks to independent calibration for each sensor type, different measurements can easily be switched without the need for recalibration.
Conductivity measurement
The MFD80 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 a temperature sensor, several preset profiles for temperature correction are available, or the appropriate linear coefficient may 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.
Additional measurement of temperature and atmospheric pressure
All inputs of the MFD80 device also support temperature measurement. Each connected sensor can therefore be equipped with an integrated temperature sensor, or a separate temperature sensor (type TTK21L) may be connected to any input. Any available temperature reading may be used for temperature correction of the measurement. If none is available, an approximate temperature reading from a sensor integrated directly in the device can be used.
The device also includes an atmospheric pressure sensor. Its reading is mainly used to correct the oxygen measurement, but it can also be displayed independently.
| Dimensions | 136 x 74 x 33 mm |
| Weight | ca 250 g (including rechargeable batteries) |
| Enclosure | IP 65 |
| Batteries | NiMH (3x AAA) or alkaline (3x AAA, 4.5 V) |
| External power | USB charger (5 V, 500 mA), table stand |
| Battery charging | Supported in the device |
| Battery life | ca 60 - 150 hrs (backlight off, depends also on configuration and battery type) |
| Data log capacity | 16000 values (also depends on configured mode) |
| Digital interfaces | USB 2.0, Bluetooth (not compatible with Apple equipment) |
| Additional system requirements | web browser |
| Download formats | CSV, HTML, plaintext |
| Oxygen measurement range - sensor CSOT53L | 0.1 - 20 mg/l or 0.1 - 150 % |
| Oxygen measurement range - sensor CSOT43L | 0.1 - 30 mg/l or 0.1 - 300 % |
| Oxygen measurement accuracy | ± 1 % (of full range, at 25 °C) |
| pH measurement range | 0 - 14 |
| pH measurement accuracy | ± 0.5 % (of full range, at 25 °C) |
| pH calibration | 3 points |
| ORP measurement range | ± 1000 mV |
| ORP measurement accuracy | ± 0.5 mV, resolution 0.1 mV |
| Supported ISE electrodes | NO3-, K+, Cl-, F-, Ca++, NH4+ |
| ISE measurement range | 0.001 to 30000 mg/l, depending on the sensor in use |
| ISE resolution | 0.1 mV |
| ISE calibration | 3 points for each sensor type |
| Conductivity measurement range | 0.1 µS/cm - 200 mS/cm (up to 1000 mS/cm with a special sensor) |
| 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 |
| Temperature measurement range | -4 to +100 °C (also limited by the sensor) |
| Temperature measurement accuracy | ± 0.2 °C (built-in backup temperature sensor ± 1.5 °C) |
| Atm. pressure measurement range | 260 - 1260 hPa |
| Atm. pressure measurement accuracy | ± 0.5 hPa (at 25 °C) |