pH Controller MFD 88 - pH
Up to 12 measurement channels (pH and temperature) simultaneously
Up to 8 output relays
RS 485 MODBUS, WIFI
The MFD 88 – pH controller is a twelve channel instrument, which can measure pH value and temperature in twelve channels simultaneously. Sensors can be at different points, at a distance of up to 500 m from the controller.
All constants specific to the particular place of measurement, (e.g. calibration constants) are stored in sensors or input blocks, so it is possible change of installation place without necessity of recalibration.
Interconnection between controllers and sensor is always accomplished by ordinary non-shielded two wire cable even in case of application with automatic mechanical cleaning.
Interface of instruments comprise: Serial RS 485 Modbus (RTU + ASCII ), WIFI for easy communication with notebooks, tablets, mobiles.
The controller is provided with four analogue active current outputs. The outputs can be configured as two state also and in this mode can operate as four more relays. The total number of relays is possible increase in this way to eight.
Four programmable relay outputs can be used for signaling of exceeding of adjusted limit values or as power contacts for controlling solenoid valves, actuators or contactors in the process.
Temperature range is expanded to – 20 to 50°C
Supply voltage can be 230V, 110V 50/60Hz and 24V=
The controller is manufactured in version T - for indoor installation and in version V - for outdoor installation.
Specifications
| Measurement Range (display) | pH 0,00 - 14,00 |
|---|---|
| Temperature -5 až 105°C | |
| Sub Ranges (Analogue Output) - pH | 0,0 to 14,0 0,0 to 10,0 |
| 2,0 to 12,0 4,0 to 14,0 | |
| 2,0 to 7,0 4,0 to 9,0 | |
| 0 to 12,0 or other | |
| Sub Ranges (Analogue Output) - Temperature | 0 to 25°C, 0 tp 50°C, 0 to 100°C or other |
| Display | backlighted graphic display |
| Outputs | active 2 or 4 outputs 0(4) - 20 mA |
| Load | max. 500 ohm |
| Temperature Compensation | automatic in range -5 to 105°C |
| Basic Accuracy - pH | ±0,3% of the range |
| Basic Accuracy - Temperature | ±0,2°C |
| Relay Outputs | none, 2 or 4 relays (set points, hysteresis, delay - programmable) voltage free contact, 250 V/50 Hz - max. 3 A *24 Vss - max. 0,5 A |
| Time Delay | 0,0 to 240 minutes |
| Controller | 2x single-parameter PID controller with analogue or pulse output |
| Automatic Sensor Cleaning | adjustable frequency in range 1 minutes to 24 hours |
| Temperature Sensors | TTK 21 |
| Enclosure | IP 65 |
| Supply Voltage | 110/230 V +6% -15%, 50/60 Hz, 24V= ±20% |
| Power | max. 20 VA |
| Dimensions | 219x184x115 mm W x H x D |
| Weight | cca 1,5 kg |
| Ambient Conditions | |
| Temperature | -20 až +50°C input unit -20 to +70°C |
| Barometric Pressure | 600 to 1060 hPa |
| Relative Humidity | 10 ... 90% |
* Valid for resistance load
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