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T24-SAf - Wireless Telemetry 2 KHz Strain Gauge Acquisition Module

Image T24-SAf

This remote load cell acquisition module provides measurement system for strain gauge, pressure, load cell, linear displacement and other 4 wire bridge sensors. Providing direct mV/V input and 5V bridge excitation for up to 4 load cells. The miniature T24-SAf size allows for the option of embedding within the sensor housing.

Low power modes allow the T24-SAf wireless current sensor acquisition module to ‘power down’ between transmissions or to ‘power off’ completely and can be controlled by other T24 products such as the handheld displays or a base station. The module can be configured to last several years on 2 x alkaline AA batteries or alternatively powered from 2 x NiMH or 1 x 3V Lithium.

The high speed electronics deliver low drift results which are transmitted at a rate of 2000 readings per second to other T24 devices such as analog outputs and base stations etc.

Although the T24-SAf can be used ‘as is’ for OEM solutions there are a number of enclosure options available. The module is configured and calibrated (either by applying known inputs or by table entry) using free T24 Toolkit software which runs on a PC connected to a T24 base station.

Integral antenna option offers up to 800m (2600 ft) range and external antenna options allows up to 800m (2600 ft) range in an open field site. 

The licence free 2.4 GHz direct sequence spread spectrum (DSSS) radio telemetry technology offers high integrity, error free communications which can co-exist with other wireless technologies such as Wi-Fi, Bluetooth® and Zigbee®. FCC, ETSI and IC approvals. 

Technical Specifications


General Radio

  Min  Typical  Max   Units
 Licence    Licence Exempt    
 Modulation Method    MS(QPSK)    
 Radio Type    Transceiver (2 way)    
 Data Rate    250    K bits/sec
 Radio Frequency  2.4000    2.4835  GHz
 Power    1    mw
 Integral Antenna      120 (400)  Metres (feet) *
External Antenna      800 (2600)  Metres (feet) *
Channels (DSSS)   16    
 *Maximum range achieved in open field site with the T24 acquisition module at a height of 3 metres (9.8 feet) above ground and T24-HS held at chest height pointing towards the acquisition module. Specification at 3V supply at 25°C 
Specifications with 1000R bridge, 2.5mV/V, at 3V supply at 25 Deg C    
Strain Gauge Excitation System     4 wire    
Strain Gauge Excitation Voltage  4.5  5  5.25  VDC
Strain Gauge Drive Capacity  85  -  5000   Ohms
Maximum Gauge Sensitivity (FR)      3.2  ±mV/V
Offset Temperature Stability    1  4  ppm/C
Gain Temperature    3  5   ppm/C
Offset Stability with Time    20  80  ppm of FR (1)
Gain Stability with Time      30  ppm of FR (2)
Non Linearity before Linearization    5  25  ppm of FR
Noise free resolution (10 Second Sample)   8000/13   Resolution/bits
Power Supply Voltage  2.1  3.0  3.6   VDC
Power Supply Ripple       50  mV ac pk-pk
Power Supply Current        
Normal Mode (1K Bridge)      60   65  mA
Standby/Low Power Mode    5  20  uA
Power Supply        
Active   35 40 mA
Sleep Mode (1K Bridge)   5  20 mA 
Estimated Battery Life using 24hr batteries:        
Standby Mode (Powered off)   1.5   Years
Continuous Operation   40   Hours
Operating Temperature Range    -40    +85   C
Storage Temperature Range  -40    +85  C
Humidity  0    95  %RH

   Module transmits and Receives giving: 1. Full error detection and correction 2. Ability to switch to low power modes 3. Calibration & configuration via radio telemetry 4. Ability to be switched from sleep to operating mode via radio 5. Calibration stored within the module 6. Remote battery check

Order Info

T24-SAf Module Code
Fast Strain Acquisition with Internal Antenna T24-SAfi
Fast Strain Acquisition with fitting for External Antenna T24-SAfe