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Level Transmitter
The MPILC series is a microprocessor based level detection assembly designed to withstand the acute environment conditions and give you accurate detection of service material level in your process unit. This continuous level indicator can be used for any solid or liquid that has a homogenous composition and a stable dielectric value.
The MPILC system has a microprocessor which checks the complete system and itself before validating the signal. A flashing green LED serves as 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 “Err--“ and the relay contacts revert to their fail-safe condition.
The MPILC continuous level measurement system uses a two-wire Pulse Frequency Modulation (PFM) for interference-free signal transmission between probe and evaluation unit. Complete indication system is checked before each measurement. The system has an auto-compensation for temperature drift in the vicinity of the pre-amplifier.
Flexibility is a feature that is deemed essential by users in a continuous monitoring environment. In the MPILC continuous level sensor, features such as operating mode (independent/pump control), delayed switching for probe covered or uncovered condition, fail-safe high or low, switching sensitivity, switching delay in seconds and set point calibration are programmable via key pad. This makes level measurement as easy as clicking a button. Moreover, the programmed parameters are stored in a non-volatile memory indefinitely requiring no battery backup.
Evaluation Unit
| Housing | Cast Aluminium Whether-proof Stoving Enamel painted, suitable for back,panel/wall mounting. |
| Cable Entries | 3 Nos. ½” BSP/NPT |
| Operating Temperature | –20 to +60º C |
| Mains | 90 -260 V AC / 50 - 60 Hz. 24V DC |
| Power Consumption | 3.5 VA approx. |
| Measuring range | 10 pF to 4500 pF |
| Offset | 30 pF to 280pF |
| Indication | Percentage display from – 50% to +150% on multipurpose 5 Digit 0.5” LED display (2” display also available in separate housing) |
| Accuracy | +/- 2% of the measuring range |
| Programming | via 5 push button keys |
| Analog Output | 4 -20 mA galvanicaly isolated output with two wire capability |
| Load Resistance | RL (Max) = 1 KΩ |
| Galvanic Isolated | 18 to 22 V (Safe RL (Max) = 800 Ω for on board supply |
| Relay output | 3 potential free relays, (rated at 6A,230V,AC, 50Hz for non-inductive load), for three point level switching Independent/pump control switching. Time delay programmable up to 99 sec. |
| Dimensions | Overall 185X185X85mm |
PRE-AMPLIFIER (Electronic Insert) LDC - 117:
| Housing | Plastic with electronics potted epoxy resin, mounted in probe head. |
| Potting | -20º C to 80º C. 12 V at 17 mA max. derived from evaluation unit only. |
| Operating Temperature | -20º C to +80º C |
| Supply | 18V DC at 10mA (approx) derived from evaluation unit |
| Measuring Frequency | 50 -250 KHz |
Probe
| Probe Head | Cast Al. weather-proof. |
| Mounting | Flange or Screwed as per requirement |
| Length : | 150 mm to 3000 mm in Rod Probe, 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. |
Note :
- Reference probe is required, when the tank is nonmetallic
- Grounding tube is required, when the liquid is turbulent or tank shape is curved
- Two core screened cable required for interconnection (Up to 1Km, user's scope)
