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Intelligent Admittance Level Limit Switch
Intelligent and Self Checking
A microprocessor checks the complete system and itself before validating the signal. A flashing green LED serves as a heartbeat to indicate a healthy system In the event of occurrence of a system fault such as incorrect wiring, open or short sensor connection, failure of 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.
Highly Reliable
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. Auto compensation for temperature drift in the vicinity of pre-amplifier.
High Degree of Programmability
Features such as operating mode (independent/pump control), delayed switching in seconds for probe covered or uncovered condition, fail-safe high or low, switching sensitivity and set point calibration are programmable via key pad. The programmed parameters are stored in a non-volatile memory indefinitely requiring no battery backup.
Ignores Build-Up
Special three-element probe and immunocoat circuitry enables the system to ignore coating on the probe, build-up from wall and suspended dust particles, but reacts only to a true level.
Easy Calibration and User-Friendly
All parameters are programmed via four keys and an interactive menu-driven display leaving no chance for incorrect entry. If recalibration is required, the old data is displayed in the program mode, which can be edited as desired.
Automatic Switch Point Optimisation
Application
Level control of solids, liquids and slurries of conductive/Non-conductive, sticky/non-sticky material requiring extreme safety and high degree of reliability in industries such as cement, food, chemical and petrochemical, effluent treatment, cosmetics, power, plastic, material handling, fly ash etc.
Evaluation Unit
| Housing | Cast aluminium, Weather-proof, Stoving enamel painted, suitable for back panel / wall mounting. |
| Cable Entry | 3 Nos. of ½” BSP /NPT /NG20 |
| Ambient Temperature | 20º C to + 60º C. |
| Mains | 110/230 V AC (-10 to +10%) 50 Hz (as specified in order). |
| Power Consumption | 5 VA approx. |
| Indication (Switching) | Red LED for each level alarm, red LED for fault alarm, flashing green LED as heart-beat for healthy condition. |
| Indication (calibration) | LCD, one digit for mode field and two digits for data field. |
| Response Time | 0.2 Second. Typical. |
| Swtiching Delay | Programmable upto 99 Second. For probe covered/ uncovered condition for each set point. |
| Connection to | 2-core ordinary cable, |
| Electronic Insert | having max. resistance of 25 W per core. |
| Initial capacitance | 20 to 1200 pF. |
| Switching Hysterisis | Approx. 0.5 pF at initial |
| (single point operation) | Capacitance of 30 pF. |
| Switching Hysterisis | Programmable over |
| (Two point pump control) | entire setting range. |
| Build-up Compensation | Approx. 0 - 99 steps |
| Relay Output | One set of potential free change over contacts per channel rated at 6A 230 V AC, 50Hz for non- inductive load. |
| Fail-Safe Mode | High or Low field programmable for both channels. |
| Weight | 2.5 Kgs approx. |
| Overall dimensions | 180 x 180 x 85 cm |
Electronic Insert
| Housing | Plastic with electronics potted in epoxy resin. |
| Measuring Frequency | 20º C to 80º C. 12 V at 17 mA max. derived from evaluation unit only. |
Probes
| Housing | Cast Aluminium, SS, FRP-coated, HDPE. |
| Mounting | Flanged or Screwed as per requirement. |
| Electrode Element | Special 3-element Probe Sense, Shield and Ground. |
| Length | 150mm 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.
