Load Cell Junction Box and Fault Monitoring Alarm (LCI)
- For the protection of multi-load cell installations such as silos, tanks
- Alarm will be activated if:
- One or more load cells are out of balance
- Any load cell is operated outside a preset mV/V range
- Excitation voltage deviates from preset range
- Any connection is lost (open circuit detection)
- Any short circuit is detected
The LCI Load Cell Junction Box with Fault Monitoring is designed for the protection of multi-load cell installations such as silos, tanks and other systems where the failure of an individual load cell can have serious consequences such as overflow or incorrect production batching . The device constantly samples the individual load cell channels and activates an alarm if any failure conditions are detected.
For a simple summing circuit with no trimming and no corner compensation, use the Load Cell Junction PCB, model JPP Load Cell Junction PCB, and for trimming and corner compensation, use the Active Junction Box, model JBA Load Cell Junction Box.
| LCI | ||||
|---|---|---|---|---|
| Faults Monitored | Load Cell out of preset balance range Load Cell out of pre-set operating range Low/high excitation Open circuit to any load cell on each connection Short circuit on any load cell connection Internal load cell fault (Bridge Imbalance) |
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| Powering Indication | By Load Cell Excitation typically 10v DC 1 x 4 digit 7 segment LED display for set up, load cell in error type & individual total mV outputs 6 buttons for reading & set up |
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| Setting Method | 2 part terminals, up to 2.5mm² cable 4 x 5 way, for load cell connection |
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| Connections | 1 x 5 way, load cell output 1 x 3 way, alarm relay contacts |
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| Dimensions | 200 x 120 x 75mm. (PCB dimensions 170 x 100mm excluding case) | |||
| Environmental | Sealed to IP65 with cable glands & blanking plugs fitted CE Compliance. | |||
| Enclosure Material | Grey ABS | |||
| Option Available | ||||
| LSS | Stainless Steel Junction Box Enclosure IP65 | |||
| Protection | ||||
| Surface Junction Box to IP65 | ||||
| Parameters | Min | Typical | Max | Units |
| Power Supply Volts from Excitation Supply | 8.2 | 10 | 10 | V dc |
| Power supply Current from Excitation Supply 1 | 43 | 52 | mA | |
| Bridge Excitation 350R Load Cell | 8 | 10 | 12 | V |
| Bridge Resistance (typically 350-700R) each | 300 | 350 | 1000 | ohms |
| Bridge Sensitivity | 1.0 | 2.0 | 5.0 | mV/V |
| Bridge No Selectable | 1 | 4 | Bridges | |
| Output Load | 1M | 100G | ohms | |
| Bandwidth of Junction Box | 100 | Hz | ||
| Zero Temperature Co-Efficient of Junction Box at 2mV/V | -0.0005 | 0 | 0.0005 | %V/°C |
| Span Temperature Co-Efficient of Junction Box | -0.0005 | 0 | 0.0005 | %/°C |
| Linearity of Junction Box | -0.0015 | 0 | 0.0015 | %FSD |
| 90 Day Stability of Junction Box | -0.001 | 0 | 0.001 | % |
| 90 Day Stability of Junction Box | -0.001 | 0 | 0.001 | %FSD |
| Operating Temperature Range | -40 | 85 | °C | |
| Storage Temperature Range | -40 | 95 | °C | |
| Humidity | 95 | % | ||
| Scan Speed for Alarm Output (4cells) | 40 | 100 | mS | |
| Display, Range | -50.00 | +50.00 | mV | |
| Relay Contacts SPCO Normally Energized | 500 | mA | ||
| Relay Contacts SPCO Normally Energized | 50 | V | ||
| Alarm Operating Speed for less than 1mV change | 100 | mS | ||
| Notes | ||||
| 1. To enable ADW15 or LCA15 to drive 4 x 350R load cells and the LCI. 2. Allowance for optional fitting of ‘Voltage absorber’ to excitation supply to protect in near lightening conditions. 3. Relay normally energised. 4. Display normally to show mV total, or fault indication if present. 5. Alarm will not function when input speed exceeds change of 1mV in 100mS. This is to prevent false alarms during sudden change of load. |
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| Environmental | ||||
| Relative Humidity | 95% maximum non condensing | |||
| CE Environmental Approvals | European EMC Directive 2004/108/EC, Low Voltage Directive 2006/95/EC | |||
Documents
Software
No relevant software available
Product order options
Please read the following before selecting the options for this product:
The model LCI is supplied pre-mounted in a IP65 / NEMA4 ABS housing but is also available as a PCB module (model LCP).
For sale only OUTSIDE UK. Call for details of outside UK supply.
For alternative housings, select model LCP and then select the desired housing from the list below.
| Options | Code |
|---|---|
| LCI with IP65 ABS Enclosure & Transparent Lid | LCI |
| LCI OEM PCB without Enclosure | LCP |
| Accessories | Code |
| ABS IP65 Enclosure for LCP | LAB |
| Stainless Steel IP65 Enclosure for LCP | LSS |
| Die Cast Case for LCP | LDC |
These are the following industries and applications in which this product has been used:
- Food Industry - Load Fault Monitoring in Bakery Production
