OEM Wireless Sensor Pulse Transmitter (T24-PA)

The high performance T24-PA transmitter module collects and processes pulse related measurements, such as speed of rotation, proximity, flow and count, forming part of the T24 modular telemetry system. The data transmitted by the T24-PA can be received by multiple T24 receivers that include displays, handheld readers, analogue outputs, relay modules and computer interfaces.

Wireless sensor pulse transmitter provides data in real time at variable speeds with a direct line of sight range of up to 800 meters which can be extended with the use of high gain antenna’s and repeaters, view our range of antennas here. Ensuring data integrity and security and avoiding local radio interference, the mini PCB module uses on license-free 2.4 Ghz.

T24 transmitters have been designed for battery operation and support an ultra low-power sleep mode whilst offering class leading wireless coverage and range. Configurable transmission rates from once per minute to 200 per second cope with a wide range of measurement and monitoring applications. A choice of enclosures enabling battery connection, field connectivity and environmental sealing up to IP67 ensure these modules provide a flexible solution to your wireless sensor requirements.

The T24-PA provides a range of excitations (3,5,12 volts). Inputs accept volt free contacts, open collector, 5 V logic and quadrature.

Selectable inputs include: frequency, count, quadrature, mark (space), digital state, rpm and interval.

Read our blog which discusses the recent upgrade of this transmitter module in more detail

The module is configured and calibrated (either by applying known inputs or by table entry) using our free T24 Toolkit software which runs on a PC connected to a T24 base station.

Click here to view and download the associated FREE software.

This module is available in the following IP rated enclosures - T24-ACM-PA, T24-ACMi-PA and T24-ACMm-PA

See the battery life of your wireless sensor system using the Battery Life Calculator.

The 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

*Maximum range achieved in open field site with the T24 acquisition module at a height of 3 metres (9.8 feet) above ground and the T24-HS held at chest height pointing towards the acquisition module. Specification at 3V supply at 25°C

 

 

 

Product order options

T24-PA	Code
Pulse Transmitter with fitting for External Antenna	T24-PAe
Pulse Transmitter with Integral Antenna	T24-PAi

These are the following industries and applications in which this product has been used:

• Automotive - Measuring the Output Power of a Motor
• Agriculture - Vessel Level Control & Flow Sensing

Q. What excitation ranges does the T24-PA provide?

A. The T24-PA transmitter module provides a range of excitations of 3, 5 and 12 volts

Q: What types of inputs can be used?

A: Any volt free contact input such as relays, voltage sources (up to 24 volts) and NPN open collector inputs.

Q. What measurement modes are available?

A. Selectable measurements include: frequency, count, quantrature, mark (space), digital state, RPM and interval

Q: How accurate is the measurement?

A: At a slow input rate of 1Hz the accuracy is 0.15% and at 3Hz the accuracy is 0.25%.  Just under half this error is to allow for temperature drift over the full operating temperature range of the T24-PA device (-40 to +85 degrees) so the accuracy in a stable temperature environment is far better.

Q: How do I calibrate the output?

A: The T24-PA is factory calibrated to the nearest 0.25 μS which provides users with a set of predefined outputs; Hz, RPM and Period. All of these values can have a custom gain and offset applied to them, the resulting output can therefore be in whatever units or range of values you require.

Q: What is the counter, and its maximum value?

A: The counter is a counter which increments every time a pulse is detected either on rising or falling edge which can be set in the tool kit. The maximum value for the counter is 4,294,967,295 at which point the counter will overflow.

Q: How do I reset the counter value of the T24-PA?

A: The counter value can be reset either by contacting the digital input to the ground or by transmitting a data packet with a defined data tag from another device, such as a T24-HA, T24-RM1 or even another T24 transmitter module. This can also be achieved with a power cycle.

Q: What software is provided with the T24 devices?

A: All devices are supported by the T24 Tool Kit which allows users to configure all devices from the T24 range as well as view and log data from transmitters modules in range. The software can also be downloaded directly from our website.

Q: How many devices can operate on one radio channel?

A: Many devices can operate on the same radio channel depending on the sample rate of the transmitter modules present in the system. The radio channel is capable of supporting up to 200 data packets per second.

Q: Can PC software gather data from many devices?

A: Yes, Mantracourt provides freeware for logging up to 100 inputs to one base station, in addition the free Windows DLL and COM driver can be used to gather data through a customer's own PC software.

Q: What limits the RF range of the devices?

A: Any metal surface will reflect 2.4 GHz radio waves, therefore in a sealed metal box, no RF will escape. However by providing a suitable RF window the signals will propagate out. Water and concrete also limit the RF range.

Q: What Frequency does the system operate on?

A: Licence free world wide 2.4GHz, although this frequency is used by other equipment, the T24 range has been tested with Bluetooth, Zigbee & WiFi devices without conflicts.

Q: Is it possible to use wireless range extenders within T24 network?

A: The T24-AR wireless range extender which can be added to the system can propagate a signal around corners and obstacles. This unit can also double the effective range - but only once.

Q: Is the system point to point?

A: Yes, however the modules may also operate in many to one (such as multiple data transmitters modules communicating with a base station) and one to many (such as a data transmitter module supplying data to multiple handhelds and displays).

Q: What is the communication protocol?

A: Proprietary protocol based on a 802.15.4 chip. This allows the T24 range to co-exist with Bluetooth, Zigbee & WiFi devices without conflicts.

Q: What are the sampling rates of the transmitter modules?

A: The T24 standard transmitter modules (SA, IA, VA, RA, TA, PA) sample from 0-200 updates/sec. The T24-SA fast transmitter modules are fixed at 2,000 updates/sec.

Q: What is the resolution of the transmitter 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: Can power be provided to a sensor?

A: Yes, all transmitter modules feature a 5V supply (except the T24-PA which has excitation available in 3,5,12 Vdc @25 mA) which is the excitation voltage used by the T24-SA strain gauge transmitter module.

Q: How is the strain gauge transmitter 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. What is the required power supply for the T24-PA?

A. This depends on the enclosure used - see options below:

• OEM / ACMm - 2.1 to 3.6 Vdc
• ACMm with BB1 - 2 x AAA batteries
• ACMi - 2 x AA batteries
• ACM - 2 x D Cell batteries or 5 - 18 Vdc

Find out the battery life of your system using our Battery Life Calculator

Q: In the T24 transmitter range what is the difference between the 'i' and 'e' ?

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 many transmitter modules can be acquired by the base stations?

A: Each base station can use one of 15 channels. From that selected channel a base station can collect data simultaneously from any number transmitter modules depending upon the frequency of readings being provided by the transmitter module.

Q: What are the input ranges of the T24 transmitter modules?

A: T24-SA 2.5mV/V calibrated strain gauge based measurement; T24-VA 0-10V, T24-IA 4-20mA, T24-TA pt100 sensor input, T24-RA potentiometer 500 to 100000 Ohms and T24-PA 0.5Hz to 3kHz.

For more 'Frequently Asked Questions' please see our Knowledge Centre

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