Wireless Telemetry 2KHz Strain Gauge Acquisition Module (T24-SAf)
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- Wireless acquisition module for strain gauge based sensor measurements such as load cells
- Ultra fast update rate of 2000 per second
- Miniature PCB for fitting inside sensors
- Low power for long battery life
- Remote power 'on' and 'off'
- Factory calibrated measurement in nV/V (nanovolts per volt)
- Simple wireless configuration
- Antenna options giving up to 200m (650 ft) range
- Only one T24-SAf supported per radio channel
- 1 years manufactures warranty
- Photos on left showing 3 case sizes available standard, for integration and miniature size enclosures
This acquisition module provides high speed measurement of strain gauge, pressure, linear displacement and other strain gauge based sensors including loadcells. The small module size allows for the option of embedding it within the sensor housing.
Low power modes allow the module 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 this module can be used ‘as is’ for OEM solutions there are a number of enclosure options available. See ‘Related Products’ tab.
Integral antenna option offers up to 100m (325 ft) range and external antenna options allows up to 200m (650 ft) range in an open field site. The module is configured using free T24 Toolkit software which runs on a PC connected to a T24 base station.
The licence free 2.4GHz direct sequence spread spectrum (DSSS) radio 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.
To view a selection of suitable antennas click here. This pcb is also available in a selection of IP rated enclosures to provide housing and powering. See T24-ACM-SAf, T24-ACMi-SAf and T24-ACMm-SAf
T24-SAf
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 | 100 (325) | Metres (feet) * | ||
| External Antenna | 200 (650) | 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 | ||||
T24-SAf |
||||
| 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 | ||
| Electrical | ||||
| 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 | ||
| Environment | ||||
| 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. Calibration & configuration via radio telemetry
3. Ability to be switched from sleep to operating mode via radio
4. mV/V Calibration stored within the module
5. Remote battery check
6. Data Encrytion for complete security (128 bit AES)
Software
Product order options
| T24-SAfi | Code |
|---|---|
| Fast Strain Acquisition with fitting with Internal Antenna | T24-SAfi |
| T24-SAfe | Code |
| Fast Strain Acquisition with fitting for External Antenna | T24-SAfe |
These are the following industries and applications in which this product has been used:
- Alternative Energy - Radio Telemetry Monitoring of Underwater Turbine
- Theatre & Events - Wireless Monitoring of Fly Bar Rigging
Wireless Sensing Module for Load Cell, Strain Gauge Data Acquisition
Wireless Sensor Converter for Strain Gauge Sensors, 0-20mA, 0-10V
Radio Telemetry Module for Strain Gauge, 0-20mA, 0-10V Sensors
Wireless Telemetry Handheld Display Multiple Inputs
Wireless Telemetry Handheld Display Single Input
Wireless Telemetry Handheld Display Unlimited Inputs
- Q: What are the sampling rates of the acquisition modules?
A: The T24 standard acquisition modules (SA, IA, VA, RA, TA, PA) sample from 0-200 updates/sec. The T24-SA fast acquisition modules are fixed at 2,000 updates/sec.
- Q: What is the resolution of the acquisition modules?
A: The noise free resolution for a sample time of 10 milli-seconds or less is 15.5 bits for the T24 SA, 12.5 bits for the T24-VA, 14 bits for the VA and 12.25 bits for the T24IA.
The T24-PA’s accuracy % input error @ 1 Hz is 0.15% and for the T24 RA the accuracy is 0.01% of the full scale.
With increased sample times resolution can be increased up to 18.75 bits for the T24-SA.
- Q: What is the supply voltage for the acquisition modules?
A: 3V for the acquisition modules and handheld displays. Other modules in the range take 9-36 V.
- Q: What is the difference between the T24-SA and T24-SAf?
A: The standard acquisition modules are capable of providing data up to 200Hz. The ‘fast’ T24-SAf provides data at a fixed 2Khz.
- Q: What is the difference between the ‘i’ and ‘e’ versions of the acquisition units?
A: The ‘i’ modules all feature an on chip integrated antenna. The ‘e’ modules are fitted with a miniature UFL connector which can be used with any of the antenna options available; the T24-ANTA (PCB antenna) or T24-ANTB (fixed 90 degree Whip antenna) or T24-ANTC (flexible whip antenna).
- Q: How is the strain gauge acquisition module calibrated?
A: The modules are factory calibrated to 2.5 mV/V which can be custom calibrated and linearised over up to 9 points by using the T24 Toolkit. The T24-SAf has fixed factory calibration and cannot be linearised.
- Q: How are the modules powered?
A: The ACMm is the smallest module and has a separate battery pack (T24-BB1 using 2 x AAA). The T24-ACMi is the mid size module and provides power via 2 x AA batteries and has terminal block style field connectors for wiring to acquisition modules. The T24-ACM although larger can provide power from an external power supply (5-18V) as well as 2 x D cell batteries which provide a higher battery capacity allowing for longer battery life.
Find out the battery life of your system using our Battery Calculator.
