TXA15101E
151MHz 4-20mA Analog Transmitter. TXA15101E
Technical Specifications
Frequency
151MHz
Applications
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Usable Receivers
RXA15101E
Supply
12 Volts DC
Coding
12-way dipswitch
Operating distance
Up to 5000 metres
Dimension
140 x 60 x 34 mm
Channel Options
1 Analog, 1 Digital
Compliance
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Elsema: Frequently Asked Questions
What is the main purpose of the TXA15101E?
The TXA15101E is an industrial-grade wireless transmitter designed to send 4-20mA analog signals (such as those from temperature, pressure, or level sensors) over long distances to a receiver, where the signal is accurately recreated.
Can the TXA15101E transmit digital signals as well?
Yes. In addition to the 4-20mA analog input, the TXA15101E features a secondary digital input for a normally open (NO) contact. Both the analog and digital signals can be transmitted simultaneously to a compatible receiver like the Elsema RXA15101E.
What is the maximum operating range?
When used with a high-quality antenna like the Elsema ANT151M and maintaining a clear line of sight, the system can achieve an operating range of up to 5,000 metres.
Why does the TXA15101E use the 151MHz frequency?
The 151MHz frequency band is specifically chosen for industrial environments because it offers superior penetration through steel construction and metal structures. Unlike higher frequencies that tend to reflect off metal, 151MHz is more effective in congested or obstructed areas.
What are the power supply requirements?
The TXA15101E operates with a power supply of 12 VDC with an absolute maximum of 14 VDC. It is highly efficient, drawing approximately 80-85mA during transmission and only 12mA while on standby.
Is the analog transmission constant or sampled?
The TXA15101E uses a burst transmission mode to conserve power and comply with regulations. You can set the sample rate using an on board trimpot:
- Mode Sw1 Off: 2 to 62 seconds between transmissions.
- Mode Sw1 On: 1 to 10 minutes between transmissions.
If the digital input is activated, the transmitter sends the new data immediately regardless of the set the sample rate.
How accurate is the recreated analog signal?
The transmitter uses a 10-bit resolution for the 4-20mA analog channel, providing high precision for industrial monitoring tasks such as tank levels or machinery status.
How do I pair the TXA15101E to the RXA15101E?
Security and pairing are handled via a 12-way DIP switch. For the transmitter to communicate with a receiver, both units must have their 12-way DIP switches set to the exact same sequence. It is highly recommended to change these from the factory default.
Can I operate multiple systems in the same area?
Yes. The TXA15101E has 8 user selectable frequencies within the 151MHz band. By setting the on-board 3-way DIP switch to different combinations, you can run multiple independent systems nearby without signal interference.
What is the internal resistance of the analog input of the TXA15101E?
The TXA15101E has an internal resistance of 200Ω on its analog input. This resistance is specifically designed to provide a stable load for standard 4-20mA current loop sensors, ensuring accurate signal conversion before the data is transmitted wirelessly.
