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Load Cell Amplifier Signal Conditioner with Removable Terminals

Made in the USA

MODEL LCA-RTC

The LCA-RTC Module provide low-cost, dedicated signal conditioning for a single bridge type load cell or torque sensor. Model LCA-RTC comes with removable screw-clamp terminal connectors, which accept wires without soldering. On- board jumper selections include sensitivities from 0.5 mV/V to 10 mV/V, bandwidths from 100 Hz to 30 kHz, and amplified outputs of 0 to ±5V, 0 to ±10V, 0-16 mA, 0-20 mA or 4-20 mA. Zero and span adjustments are via precision 25-turn low-tempco metal film potentiometers. The units can be operated next to the sensor with 4-wire hookup or at distances up to 1 km (3300 feet) with 6-wire hookup. An onboard 87.325 kΩ resistor allows easy shunt calibration at the push of a button. Provision is also made for a user-furnished calibration resistor. Power requirements are 12 to 26 Vdc with load currents from 10 to 60 mA, the latter applying when the unit provides 10 Vdc excitation to a 350 ohm load cell and delivers a 20 mA analog output.

LCA-RTC load cell amplifier signal conditioner
Features
  • Power Requirement 12 to 26 Vdc
  • Bridge Excitation 5 to 10 Vdc
  • Bridge Sensitivity 0.5 mV/V to 10 mV/V
  • Push Button Shunt Calibration Network
  • Two-Pole Low Pass Selectable Filter 100 HZ to 30 kHZ
  • Analog Outputs 0 to ±5V, 0 to ±10V, 0-16 mA, 0-20 mA
    or 4-20 mA
Price
LCA-RTC N/A 425.00
Accessories
APD-12-VDC N/A 50.00
ATB-1 N/A 50.00
ATP-T N/A 12.00
ADR-KIT N/A 50.00
Specifications

Signal Input
Voltage Range ±2.5 mV min to 100 mV max
Voltage Sensitivity 0 to 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 4.0 or 10 mV/V (jumper selectable)
Polarity Reversal Jumper selectable
Offset Voltage ±10 µV typ, ±30 µV max
Offset Voltage Tempco ±0.04 µV/°C typ, ±1.2 µV/°C max
Power Supply Rejection ±0.1 µV/V typ, ±0.3 µV/V max
Offset Voltage Aging ±2 µV/1000h typ, ±6 µV/1000h max
Bias Current ±0.3 nA typ, ±2.8 nA max
Voltage Noise at 0.1 to 10 Hz 350 nVpp or 56 nVrms typ (0.1 to 10 Hz)
Voltage Noise Density 12.4 nV/√Hz typ at 1kHz
Differential Resistance 1 GΩ min
Common Mode Resistance 100 GΩ typ
Common Mode Voltage -5.5V to +5.5 Vdc

Signal Output
Amplifier Type Differential, bipolar
Voltage Ranges 0 to ±5V, 0 to ±10V (jumper selectable)
Voltage Load 5 kΩ min
Gain Range 50 to 4000
Noise and Ripple See chart on page 14. of LCA Operator Manual
Current Source 0-16 mA, 0-20 mA or 4-20 mA (jumper selectable)
Current Load 0-500Ω (10V compliance)
Nonlinearity ±0.005% of FS max
Zero Adjust ±10% of FS min
Zero Stability ±0.05% of FS max for 8 hours
Zero Tempco ±0.003%/°C of FS max
Span Adjust ±24% of FS min
Span Accuracy ±0.05% of FS max
Span Stability ±0.01% of FS max for 8 hours
Span Tempco ±0.003%/°C of FS max
Filter Configuration Two-pole low pass (jumper selectable)
Selectable Frequency Response DC to 0.1, 0.3, 1.0k, 3.0, 10, 30 kHz (-6 dB points)

Excitation Output
Voltage Output 5 or 10 Vdc ±2%
Load Current 0-30 mA
Load Resistance 350Ω min
Voltage Tempco ±0.005%/°C max
Load Cell Connection 4 or 6 wires (jumper selectable)
Compensation for changes in lead resistance. 0.0025% of span max / 1Ω (sum of + and - lead resistance changes with 6-wire connection to 350Ω load cell)

Power Requirements
Module Voltage 11.8V to 26 Vdc
Protection for Reverse Polarity - 40 Vdc
Current 40 mA with 350Ω LC at 10V exc and no load on V₀
  60 mA with 350Ω LC at 10V exc and 20 mA out on I₀
AC Adapter Ratings 120 Vac, 60 Hz input; 12 Vdc, 200 mA output
AC Adapter Safety UL and CSA safety certifications

Calibration
Standard Shunt Cal Resistor 87.325 kΩ ±0.025% selectable via push-button switch
Custom Shunt Cal Resistor Sockets for leads of user furnished cal resistor

General
Operating Temperature 0 to 55°C for full specs, - 40 to +70°C, non-condensing, with derated specs
Case Material ABS 94HB thermoplastic polymer
Dimensions, Plastic Case 2.7” x 1.7” x 0.8”, 70 x 43 x 20 mm, L x W x H
Dimensions with DB9 3.1” x 1.7” x 0.8”, 78 x 43 x 20 mm, L x W x H
  For length, make allowance for user furnished DB9 mating connectors.
Dimensions with Plugs 3.5” x 1.7” x 0.8”, 90 x 43 x 20 mm, L x W x H
  For length, add 10 mm (0.4”) on each side for furnished cable connectors.
Weight 1.4 oz (40g) for LCA-9PC, 1.6 oz (45g) for LCA-RTC
Provision for DIN rail mounting Accessory DIN rail mount, P/N ADR-KIT
Voltage & Current Noise Output, Peak to Peak, Typical
mV/V Gain* Bandwidth (-6 db)
0.1 kHz 0.3 kHz 1.0 kHz 3.0 kHz 10 kHz 30 kHz
mV µA mV µA mV µA mV µA mV µA mV µA
0.5 2000 8 70 10 70 12 70 15 80 20 80 50 90
1.0 1000 6 70 7 70 8 70 10 70 12 70 50 80
1.5 667 6 70 7 70 8 70 10 70 12 70 40 70
2.0 500 6 70 7 70 8 70 10 70 12 70 40 70
2.5 400 6 70 7 70 8 70 10 70 12 70 40 70
3.0 333 6 70 7 70 8 70 10 70 12 70 40 70
4.0 250 6 70 7 70 8 70 10 70 12 70 40 70
10 100 6 70 7 70 8 70 10 70 12 70 40 70
* Gain is for 10V excitation and 0-10V voltage output
Price
LCA-RTC N/A 425.00
Accessories
APD-12-VDC N/A 50.00
ATB-1 N/A 50.00
ATP-T N/A 12.00
ADR-KIT N/A 50.00