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
- Exceptionally low power for long battery life (up to 5 years)
- Remote power 'on' and 'off'
- Factory calibrated measurement
- Simple wireless configuration and calibration
- Antenna options giving up to 200m (650 ft) range
- Small cased version available (shown on thumbnail image on left)
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.
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 achived in open field site at height of 3 metres (9.8 feet) above ground. | ||||
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 - Wireless Water Turbine Monitoring
- Theatre & Outside Events - Wireless Monitoring of Fly Bar Rigging
T24 Antenna Options
Wireless Telemetry Acquisition Enclosure
Wireless Telemetry Handheld Display Single Input
Wireless Telemetry Handheld Display Unlimited Inputs
Wireless Telemetry Handheld Display Multiple Inputs
- Q: What are the sampling rates of the acquisition modules?
A: The T24 standard acquisition modules (SA, IA, VA) sample from 0-200 updates/sec. The T24 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 and 12.25 bits for the T24IA. 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 (T24-SAi, T24-SAfi, T24-VAi, T24-IAi) all feature an on chip
integrated antenna. The ‘e’ modules (T24-SAe, T24-SAfe, T24-VAe, T24-IAe) 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 are the strain gauge acquisition modules 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.
- Q: How are the modules powered?
A: Two standard AA batteries or the T24-BC1 Battery Charger, which provides a re-chargeable power supply using a Li-ion Cell.
