Wireless Telemetry Current (4-20mA) Acquisition (T24-IA)

Wireless Telemetry Current (4-20mA) Acquisition (T24-IA) 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. […]

Wireless Telemetry Current (4-20mA) Acquisition (T24-IA)

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 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 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.

  • Radio telemetry acquisition module for 0-20mA wireless current transmitter
  • 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 30,000 (14.75 bit)
  • Simple configuration and calibration
  • Antenna options giving up to 200m (650 ft) range
  • Choice of enclosures T24-ACM, T24-ACMi, T24-ACMm (see thumbnail image on left & ‘Related Products’ below)

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 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
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

 

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