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ROF
MPROF... The reliable rate of flow indicator
INTRODUCTION:
The MPROF Rate of Flow indicator is a capacitance based solution for reliable detection of rate of flow of liquids in an open channel. The level change is measured using the capacitance principle and converted to rate of flow utilizing the appropriate formula. The MPROF system has an interactive user interface offering you to choose from any of the below mentioned hydraulic devices:
Cipoletti
Fully Contracted Rectangular
Standard Suppressed Rectangular OR 90° Notch Triangular Weir or Custom K & N Factor Entry
Once you choose the hydraulic device of your choice, calculations of the flow rate are automatically done by the built-in microcontroller and the value displayed in percentage (%), cusecs or custom units as per choice. The system can display the level in % or in millimeters, if so desired.
A Galvanically isolated 4 to 20 mA analog output, which can be configured via user interface to be either proportional to level or rate of flow, is available. Three relays, whose function is software configurable, have one potential free contact each. They can be configured to either operate as per level change or as per flow rate change, as desired. All other functions such as calibration, fail safe mode selection, switching time delay and delay modes can be configured via the user interface. A very stable and noise free signal communication, using digitally encoded current pulses, over a simple 2-wire interconnection between the electronic insert the evaluation unit, ensures a high degree reliability.
Salient Features:
Microprocessor based system for higher degree reliability and stable operation in noisy environment due to intelligent digital communication between the electronic insert and the evaluation unit.
- All parameters programmable via Five keys and Five multipurpose LED displays. No potentiometer settings required.
- Galvanically isolated 4 to 20ma output proportional to either level or flow.
- Three relays for programming three levels / flow independently or as per pump- control logic.
- One potential free change over relay output contact per relay.
- Built-in universal power supply for 90 to 260 V AC or 24V DC operation.
- System constants K & N, alarm set points, Hysteresis, calibration and Display mode programmable at site.
Applications:
Suitable for measuring rate of flow of running water in open channels in filter stations, water treatment plants, effluent treatment plants, chemical plants etc.
Principle Of Operation:
When the liquid flows through a Hydraulic measuring device (Weir), the level of the liquid is directly proportional to the rate of flow. By knowing the constants of the Weir, flow rate can be calculated by the formula: Q = K * Ln , where Q is the rate of flow in cubic meters per hour, L is the level in meters, k & n are constants that depend on the Hydraulic device.
Evaluation Unit
| Housing | Cast aluminum, weather proof, stoving enamel painted, suitable for back panel/wall mounting |
| Cable Entry | 3 Nos. ½” BSP / NPT |
| Tolerable ambient temp | -20°C to +60°C |
| Power supply | 90 to 260V AC 50Hz, and 24V DC |
| Power consumption | 3.5VA (approx.) |
| Utilizable span | 10 to 4500 PF |
| Zero setting range | 30 to 280 PF |
| Indication range | 50% to 150% on multipurpose 5 digit 0.5” LED |
| Accuracy | +/- 1% FSD |
| Switching Hysterisis | 1% in single point switching and 1 to 98% selectable in 2 point Pump control logic. |
| Programming interface | 5 Push Button Keys |
| Analog output | 4 to 20 ma galvanically isolated into Max 1K Ohm load for 24V DC user supply. Max 800 Ohm for internal isolated supply of 18 to 22 V DC. |
| Output | 3 sets of potential free change over contacts rated at 6A, 230V, AC, 50Hz for non-inductive loads |
| Switching delay | Programmable up to 99 sec. |
| Fail-safe | High/Low field programmable |
| Dimensions | 180 x 180 x 85 mm |
PRE-AMPLIFIER (electronic insert) LDC117
| Housing | Plastic with electronics potted, mounted in Probe Head |
| Operating Temp. | - 20 to +80 deg. C |
| Supply | 18 V DC at 8ma (approx.) derived from evaluation unit |
| Measuring Frequency | 250Hz to 20 KHz reverse frequency measurement |
Probe
| Probe Head : Cast Aluminum weather proof Mounting Flanged or screwed as per requirement standard Length 750 to 1500 mm Rigid, with grounding tube as reference and still-well. Insulation Full PTFE NB: 1) Reference probe required for non metallic tanks / weirs. 2) Grounding tube required for turbulent liquids. 3) 2-core shielded cable required for electronic insert to Evaluation unit interconnection up to 1 km. (users’ scope). |
