LT1240 Panel Mount Load Cell Indicator





The LT1240 panel mount load cell indicator is a precision digital indicator for load cell and strain gauge applications.

The high bright 6-digit 14 segment LED displays make for easy setup and readability. A simple menu system with built in help hints allows for easy configuration of display and load cell settings. The load cell calibration can be done directly from the load cell calibration certificate or from using known weights.

A universal mains switch mode power supply (85-264VAC) is provided as standard but an optional low voltage (10-30VDC) isolated power supply or a high voltage (25-70VDC) isolated power supply can be installed. The LT1240 contains precision front end circuitry for high accuracy and stability. The load cell bridge excitation voltage can be field selectable for 5VDC or 10VDC and provides for a Kelvin sensed feedback to compensate for cable loss.

The LT1240 can power up to 4×350Ω load cells at 10V excitation. The LT240 can interface to both 4­wire and 6­wire load cells.

RS232 communications is supplied as standard with the MODBUS™ RTU and MODBUS™ ASCII protocol. A simple ASCII out protocol is also provided for serial printing and communicating to large displays. A second communication
RS485 interface can be added in conjunction with the standard RS232 interface.

The LT1240 also includes advanced features such as auto-zero tracking, user input linearization, max/min recording,programmable front push buttons, programmable digital inputs, security menu lockout, motion indication, advanced digital filtering, plus many more to provide a all in one precision load cell indicator.



  • 4 or 6 wire load cell / strain gauge input Field jumper selectable 5V or 10V load cell / bridge excitation voltage (Kelvin force sense excitation voltage to compensate for cable loss)
  • Can power up to 4×350Ω load cells at 10V excitation voltage
  • High precision 22bit ADC front end circuitry
  • -199999 to +999999 display counts
  • High bright 6-digit 14 segment LED displays for easy setup and calibration
  • Easy calibration either from the load cell calibration certificate or by using known weights
  • RS232 communications standard (MODBUS™ RTU/ASCII and an Infiniteq ASCII out protocol)
  • Type 4X, NEMA 4X front panel. 96X48 ABS/Polycarbonate enclosure
  • Universal mains switch mode power supply (85-264VAC) standard with built in EMI and fuse protection
  • 2x Programmable digital inputs (pull up or pull down field jumper selectable)
  • 3x Programmable front panel push buttons
  • 16 Point lineariser provided as standard
  • Auto-zero tracking function provided as standard
  • Selectable/adjustable advanced digital filtering
  • Motion indication and Net front panel LED status
  • Up to 4 front panel LED indicators for alarm setpoint status (Mechanical or solid-state option required)
  • Max/Min recording provided as standard
  • Built in menu help hints
  • Field upgradable firmware via the RS232 interface
  • 1 Year Warranty

Additional hardware options include:

  • Up to 4 Mechanical (FORM-C) or solid state (FORM-A) alarm setpoints
  • Analog output (0/4-20mA, 0-10V, +-10V)
  • Second communication RS485 interface
  • RTC (Real Time clock) option for time and date stamping
  • Low voltage 10-30VDC Isolated power supply
  • High voltage 25-70VDC Isolated power supply






Dimensions, cutout & wiring


Hardware Connections (Lower Terminals)



Hardware Connections (Upper Terminals – Option PCB)



Ordering Information

Add option codes to suffix of model number separated by hyphens.

(LT1240 Weighing indicator with 2 mechanical relays, analog output and an additional RS485 interface)

Option part numbers:
700 – Low voltage 10-30VDC isolated power supply
701 – High voltage 25-70VDC isolated power supply
710 – 1 Mechanical relay
711 – 2 Mechanical relays
712 – 3 Mechanical relays
713 – 4 Mechanical relays
720 – 1 Solid-state relay
721 – 2 Solid-state relays
722 – 3 Solid-state relays
723 – 4 Solid-state relays
LT1240 Panel Mount Load Cell Indicator Page 7
730 – Analog Output (0/4-20mA, 10V, +-10V)
740 – Second communication RS485 interface
750 – RTC (Real Time Clock)
760 – Panel mount engineering units
761 – Power connector protective cover
762 – 115VAC Inductive load suppressor
763 – 230VAC Inductive load suppressor
764 – 2A Slow blow panel meter replacement fuse



Specifications of the products displayed herein are subject to change without notice. Loadtech Loadcells (pty) ltd, or anyone on its behalf, assumes no responsibility or liability for any errors or inaccuracies. Information contained herein is intended to provide a product description only. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document. Except as provided in LoadtechÓs
terms and conditions of sale for such products, Loadtech assumes no liability whatsoever, and disclaims any express or implied warranty, relating to sale and/or use of Loadtech products including liability or warranties relating to fitness
for a particular purpose, merchantability, or infringement of any patent, copyright, or other intellectual property right.

The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications. Customers using or selling these products for use in such applications do so at their own risk and agree to fully
indemnify Loadtech load cells for any damages resulting from such improper use or sale.



This product carries a warranty for a period of one year from date of purchase against faulty workmanship or defective materials, provided there is no evidence that the unit has been mishandled or misused. Warranty is limited to the
replacement of faulty components and includes the cost of labor. Shipping costs are for the account of the purchaser.
Note: Product warranty excludes damages caused by unprotected, unsuitable or incorrectly wired
electrical supplies and or sensors, and damage caused by inductive loads