At a Glance
- 2.4GHz Operating Frequency (Licence Free)
- Range: up to 600m (internal antenna) / up to 800m (external antenna)
- Strain Gauge Bridge Input
- Resolution up to 400,000 divisions
- Very Low Power Consumption
- Wireless Monitoring for your Load, Pressure, Torque or Strain Gauge Displacement Sensor
- Miniature PCB Ideal for OEM Integration
- Integration Within a Sensor or Separate Module to Suit Your Design
- High Speed Updates of 200 Per Second
- Simple Wireless Setup
- Fantastic Wireless Transmission Range – Up to 800 metres!
Description
The T24-SA wireless strain gauge transmitter module enables high accuracy wireless measurement of signals from bridge-based transducers such as load cells, pressure sensors, torque transducers and strain gauge displacement sensors.
Transmission ranges of up to 600 metres are possible using the internal antenna, while the use of an external antenna increases transmission range up to 800 metres.
The T24-SA wireless strain gauge transmitter module requires a power supply of just 3Vdc to operate which is typically provided by 2x ‘AA’ batteries and provides a highly stable, high resolution signal that can be received by any of the T24 range of 2.4GHz telemetry instrumentation.
Output rates of up to 200 readings/second are possible at a noise-free resolution of 1 in 50,000, increasing to 1 in 400,000 at a reduced output rate of 1 reading/10 seconds.
The compact T24-SA module can be integrated into load cells and other sensors if sufficient space is available. Alternatively, it can be mounted into either the T24-ACM(2x ‘D’ size batteries) or T24-ACMi (2x ‘AA’ size batteries) battery-powered modules to complete your wireless sensor.
Please contact our expert sales team using the form in the sidebar, call us on +44 (0) 1189 817339, or send an email to info@appmeas.co.uk and we will be happy to assist you with your enquiry.
Technical Specifications
| Radio | Min | Typical | Max | Units |
|---|---|---|---|---|
| Licence | Licence Exempt | |||
| Modulation Method | MS (QPSK) | |||
| Radio Type | Transceiver (2 way) | |||
| Data Rate | 250 | K bits / second | ||
| Radio Frequency | 2.4 | 2.4835 | GHz | |
| Power | 10 | mw | ||
| Range* | 800 | Metres | ||
| Channels (DSSS) | 15 | |||
| *Tests conducted in an open field site with the transmitter at the top of a 3m pole. The receiver was mounted 1.5m off the ground. | ||||
| Strain Gauge Excitation System | - | 4 wire | ||
| Strain Gauge Excitation Voltage | 4.5 | 5 | 5.25 | Vdc |
| Strain Gauge Resistance | 85 | Ω | ||
| Strain Gauge Sensitivity | 3.2 | +/-mV/V | ||
| Offset Temperature Stability | 1 | 4 | ppm/˚C | |
| Gain Temperature Stability | 3 | 5 | ppm/˚C | |
| Non Linearity Before Linearisation | 25 | ppm of FR | ||
| Internal Resolution/Bits | 16,000,000 / 24 | Resolution / Bits | ||
| Noise Free Resolution at 1 Sample per Second | 400,000 / 18.75 | Resolution/Bits | ||
| Transmission Rates | From 5 ms to 1 day | |||
| Power Supply | ||||
| ACMi and OEM Module | 2.1 | 3.6 | Vdc | |
| ACM | 5 | 18 | Vdc | |
| Battery Life - Transmitting results at 3 per second, 350R Strain Bridge | Usage | Battery Life | ||
| Pair AA cells | Constantly on | 3 weeks | ||
| Pair AA cells | 12 sessions per day of 5 minutes | 2 years | ||
| Pair DD cells | Constantly on | 3.5 months | ||
| Pair DD cells | 12 sessions per day of 5 minutes | >5 years | ||
| Environmental | ||||
| Operating Temperature Range | -20 | 55 | °C | |
| Storage Temperature Range (no batteries) | -40 | 85 | °C | |
| Humidity | 0 | 95 | %RH | |
| IP Rating (ACM and ACMi) | IP67/Nema4 | |||
| Enclosure | ACM | ACMi | ACMm |
|---|---|---|---|
| Wireless Range / m | 800m (2,600 ft) | 500m (1,600 ft) | |
| Power Supply | 3-18 Vdc or 2xD cell | 3 Vdc (2xAA) | 3 Vdc (2xAAA with BB1) |
| Battery Life at 1 transmission per second* | 1 year | 5 months | 2 months |
| Antenna | ANTA | ANTA | PCB Printed |
| Radio Frequency | 2.4 GHz | ||
| Operating Temperature /˚C | -20 to +55 | -20 to +55 | -40 to +80 |
| Environmental Protection | IP67 | IP50 | |
| Module Size / mm | 164 x 84 x 57 | 80 x 62 x 34 | 76 x 35 x 20 |
| Software & Configuration | T24 Toolkit & T24LOG100 | ||
Product Dimensions
Case Studies
How to measure grip strength of an eagle for BBC Natural World
Last year, we were asked to design a sensor to measure the grip strength of a golden eagle named Tilly, for the award-winning BBC documentary series, Natural World. Challenge - to find a load cell that could withstand the estimated grip strength of an eagle. As Tilly had been trained to catch and grip a tennis ball, the load cell needed to be small enough to fit inside a similar-sized measuring device yet withstand Tilly's tremendous grip strength. Thanks to their unique design, our DBBSMM miniature s-beam load cells were ideal for the job. Not only are they very compact but their s-shaped design offers superior side-load rejection and high accuracy.
