Wireless Telemetry Current (4-20mA) Acquisition Module (T24-IA)
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- Radio telemetry acquisition module for 0-20mA current input
- Miniature PCB for fitting inside sensors
- Exceptionally low power for long battery life
- Remote power 'on' and 'off'
- High speed 200 updates per second
- High resolution of 1 part in 400,000 (18 bit)
- Simple configuration and calibration
- Antenna options giving up to 200m (650 ft) range
- Small cased version (shown on thumbnail image on left)
This acquisition module provides wireless current measurement for an input range of 0-20mA. Suitable for a range of 4-20mA sensors such as pressure, inclinometer, accelerometer, temperature & displacement. The small module size allows for the option of embedding it within the sensor housing. Provides 5V sensor power.
Low power modes allow the 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 accuracy, low noise measurement electronics deliver high resolution, low drift results which can be user calibrated over 9 points to enable linearization and to deliver results in user definable engineering units. The results can be transmitted wirelessly at rates up to 200 per second to other T24 devices such as handheld displays, 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. 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 100m (325 ft) range and external antenna options allows up to 200m (650 ft) range in an open field site.
The licence free 2.4GHz 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.
T24-IA
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 | 200 (650) | Metres (feet) * | ||
| Channels (DSSS) | 16 | |||
| *Maximum range achieved in open field site at a height of 3 metres (9.8 feet) above ground. | ||||
| Specification at 3V supply at 25 Deg C | ||||
| Input Range Sensitivity (FR) | 0 | - | 21 | mA |
| Calibrated Range | 4 | - | 20 | mA |
| Gain Temperature Stability | - | - | 50 | ppm/C |
| Non Linerarity Before Linearization | - | 5 | 25 | ppm of FR |
| Internal Resolution | - | 16,000,000/24 | - | Resolution/ Bits |
| Input Impedence | - | 47 | - | Ohms |
| Input Calibration Accuracy | - | - | 0.1 | %FR |
| Noise Free where Sample TIme < 10mS | - | 5,000/12.5 | Resolution/ Bits | |
| Noise Free where Sample Time < 100mS | - | 6,000/12.75 | Resolution/ Bits | |
| Noise Free where Sample Time < 1000mS | - | 10,000/13.25 | Resolution/ Bits | |
| Noise Free where Sample Time > 1000mS | - | 30,000/14.75 | Resolution/ Bits | |
| Electrical | ||||
| Power Supply Voltage | 2.1 | 3.0 | 3.6 | V dc |
| Power Supply Voltage | 50 | mV ac pk-pk | ||
| Power Supply Current | ||||
| Normal Mode on Constantly | 40 | 45 | mA | |
| Sleep Mode | 5 | 20 | uA | |
| Environmental | ||||
| Operating Temperature Range | -40 | +85 | C | |
| Storage Temperature | -40 | +85 | C | |
| Humidity | 0 | 95 | %RH | |
| Battery Life in Low Power Mode Generating Results at 3Hz | Usage | Battery Life |
|---|---|---|
| Pair AA Cells | Constantly On | 1 Month |
| Pair AA Cells | 12 sessions per day of 5 minutes | 2 Years |
| Pair D Cells | Constantly On | 2.5 Months |
| Pair D Cells | 12 sessions per day of 5 minutes | 5 Years |
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
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Product order options
| T24-IA | Code |
|---|---|
| Current Acquisition with fitting for External Antenna (not incl) | T24-IAe |
| Current Acquisition with Internal Antenna | T24-IAi |
These are the following industries and applications in which this product has been used:
- Chemical - Wireless Valve Control
- Civil Engineering - Wireless Bridge Surveying via GPRS
- Oil & Gas - Wireless Valve Control
- Industrial Processing - Wireless Valve Control
Wireless Telemetry Acquisition Enclosure
T24 Antenna Options
Wireless Telemetry Handheld Display Multiple Inputs
Wireless Telemetry Handheld Display Single Input
Wireless Telemetry Handheld Display Unlimited Inputs
Wireless Telemetry Printer and Display Driver
- 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 ‘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 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.
- For more 'Frequently Asked Questions' please see our Knowledge Centre
- Q: What inputs are available to the T24 system?
A: T24-SA 2.5mV/V calibrated strain guage based measurement; T24-VA 0-10V, T24-IA 4-20mA.
