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industrial instrument in India


In an application, the measuring electrode (sense probe) is provided with a stilling tube which forms a capacitor. The amount of capacitance of this capacitor is governed by the level of water between the two electrodes (sense probe & stilling tube). ROF measures the Change of Capacitance to measure the Change of Level of the water. This level is then converted to the Rate of Flow, depending on the weir type selected or K,n parameter entered for the equation for calculating Flow Rate.


Latest RISC core microcontroller technology

Multi-purpose 5 digit Seven Segment LED display for best resolution and better viewing from distance

Built-in “Time Aware” Totalizer function

Built-in equations along with custom Q=Kh^n for various weir types

Selectable Display for ROF / Level / ROF% / Level%

Two wire Pulse Coded Digital communication enabling two sensors to be connected on same pair of wires to the evaluation unit. Supporting as far as 1 KM distance between Sensor and Evaluation Unit with shielded two core cables

Three independent potential-free relays, providing flexibility of selecting six combinations of switching

Galvanically isolated true two wire 4-20mA proportional to 0.0% and 100.0% level is available for remote indication purposes

Two wire implementation solves the malfunction problems that occurs with various PLC 4-20 input interfaces and thus better suits for higher-end automation

4-20mA loop can handle 700 Ohm loop resistance with internal isolated supply. The loop resistance can be 1K Ohm for external DC Supply of 24 Volts

Mechanical Specifications

Electrical Specifications


Plastic potted with epoxy resin

Power Supply

16VDC @ 5mA derived from Sensor Communication Interface of Evaluation Unit

Measuring Frequency

250Khz to 20Khz

Reverse Frequency Measurement


10 counts per PF


Digitally Encoded Current (8mA – 16mA) Pulse

Power Supply

Universal Mains 90 to 265 V AC, 50/60 Hz and 24 V DC

Power Consumption

3 Watts

Cable Specification

Resistance per core not to exceed 30 Ohms

Use of Shielded Twisted Pair Cables is recommended for long runs of cable

Cable Lengths of 1000 Meters are thus supported with Grounded Cable Shields

Zero% Range

30pf to 250pf

100% Range

10pf to 4500pf (Difference from Zero%)

RL max = 700 Ohm using internal isolated supply

RL max = 1K Ohm for external loop supply of 24 V DC

Current: 4-20mA


3 potential-free relays with one set of potential-free change over contact per relay

Contact Ratings: 6 Amp @ 230 V AC 50/60 Hz for non-inductive loads

Switching Hysteresis

1% in Single-point switching

1 to 98% selectable in pump control

Applications Specifications

Measuring differential level In Open Channel

Water treatment plants

Filtration stations

Effluent treatment plants

Switching Indication

Seven Segment Display

LED for 3 Relay Outputs

Switching: 5mm Red LEDs’ for Alarm Indication

Continuous: -50% to 150% digitally on 1”2 Seven Segment Display