Electromechanical
RF-Capacitance
RF-Admittance
Conductivity

Capacitance Level Switch

We call this series the “Intelligent Capacitance Level switch series”. And we do so because this level switch has a microprocessor that checks the complete system (including itself) before validating a signal. You will see a flashing green LED that serves as heartbeat to indicate a healthy system. In the case of a system fault ,which may result due to incorrect wiring, open or short sensor connection, inadequate probe insulation improper grounding or electronic insert failure, the heartbeat stops fault LED glows, display indicates “E---“ and the relay contacts revert to their fail-safe condition.

The MP-SLC level switch is a highly reliable liquid and solids level indicator. A two wire Pulse Frequency Modulation (PFM) is used for interference-free signal transmission between probe and evaluation unit. Complete system is checked before each measurement and the system has a provision for auto-compensation for temperature drift in the vicinity of a pre-amplifier.

The MP-SLC... series exhibits a high degree programmability. Important functions such as operating mode (independent/pump control), delayed switching for probe covered/uncovered conditions, fail safe high/low, switching sensitivity, switching delay and set point calibration are programmable via a keypad. You can store the programmed parameters in a non-volatile memory indefinitely requiring no battery backup.

 

Technical Data

Evaluation Unit

 
Housing : Cast aluminium, Weather-proof Stoving enamel painted, suitable for  
  back panel/wall mounting.
Cable Entries : 3 Nos. of ½” BSP
Mains : 110 V or 230 V AC (-10 to +10%) 50 Hz (as specified in order).
Power Consumption : 5 VA approx.

Initial Capacitance Adjustment

: 30 pF to 280 pF in two selectable ranges.
Indication : 2½ digit, 0.5 inch Red LED display; 2 inch display is also available in
  separate housing
Operating Temperature : -20o C to +60o C

Utilizable Capacitance Variation

: 10 pF to 4500 pF in three selectable ranges.
Accuracy : ± 2% of the F.S.D.
Outputs : 0 -100% digital display 0/4 -20 mA into RL max. 400 Ohms and 0 -5 V
  DC for RL >25 KW for remote indicators and recorders.
Dimensions : 185 mm x 185 mm x 85 mm
Weight : 2.3 Kg (approx.)
 
Electronic Insert - LCD 312

Housing

: Plastic with electronics potted in epoxy resin.
Supply : 20 V DC max. 10 mA. derived from Evaluation Unit.
Measuring Frequency : 33 K Hz (approx.)
Operating Temperature : -20o C to + 60o C.
 

Probe

Housing

: Cast Aluminium , SS, FRP-coated, HDPE.
Mounting : Flanged or Screwed as per requirement.
Length : : 150 mm to 3000 mm in Rod, Greater than 3000 mm in Rope.
Insulation : Part or full PVC, PTFE, Ceramic (Part only) depending on service temperature of 80o C,
  200o C or 400o C respectively.

Reference probe is required, when the tank is non-metallic.
Grounding tube is required, when the liquid is turbulent or tank shape is curved.


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