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TXA15101E
Single
Channel, 151MHz Analog Transmitter
Features
• 1 analog channel which is 4-20mA with 10 bit accuracy
• 1 digital channel which is a normally open contact
• Up to 5 km range with line of sight operation
• 12 way dip switch to set transmitter and receiver ID
Applications
• Monitoring storage tank levels
• Remote temperature and humidity monitoring
• Monitoring flow rates, industrial equipment and machinery
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 Download Datasheet
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Description
The TXA15101E is an analog and digital 151 MHz transmitter. The analog signal, normally 4-20mA is transmitted and then recreated at the receivers (RXA15101E) analog output. Also, the normally open digital contact can be simultaneously transmitted with the analog signal. This eliminates the high cost of wiring and has the flexibility of wireless data collection.
Using 151MHz has superior penetration in congested industrial environments with steel construction. Higher frequencies such as 433MHz or 915MHz tend to reflect of metal and make wireless data collection difficult.
The on board 12-way dip switch sets the ID for the transmitter. This has to be matched to the 12 way dip switch on the receiver for a
No case version is also available - TXA15101
The TXA15101 transmitter is the PCB assembly only, while the TAX15101E transmitter is enclosed in an alloy metal case.
External supply connection and SO239 antenna socket is provided with the transmitter.
Modes
The one way mode switch on the board selects the sampling transmission rate.
Mode Sw. 1 OFF : Sample Rate 2 to 62 seconds.
Transmitter will transmit a 1.5 second transmission burst and then stop for the time selected. The time is user selectable between 2 to 62 seconds by adjusting the trimpot of the transmitter board. If the digital input is activated during the "off delay" period the new data will be transmitted immediately. The transmitter will indefinitely transmit if the supply is connected.
Mode Sw. 1 ON : Off Delay 1 to 10 minutes.
Same as mode 1 except the sample rate is user selectable between 1 to 10 minutes.
Longer sample rates are possible. Contact Elsema.
Operating Frequency
There are 7 selectable frequencies available. This is achieved by setting the 3-way dipswitch. The default setting is for 151.6MHz (All 3 dipswitches “ON”). Following is a table with the Dipswitch settings and the corresponding frequencies.
Frequency |
1 |
2 |
3 |
151.600 MHz |
On |
On |
On |
152.375 MHz |
Off |
On |
On |
151.775 MHz |
On |
Off |
On |
151.400 MHz |
Off |
Off |
On |
151.175MHz |
On |
On |
Off |
151.025 MHz |
Off |
On |
Off |
150.900 MHz |
On |
Off |
Off |
150.825 MHz |
Off |
Off |
Off |
Technical Data
Power Supply |
11 to 13.6VDC (for constant RF output), screw type terminal. Absolute maximum 14VDC. |
Battery Operation |
9 Volts Battery, with additional wire link added by user. See picture below. Warning: DO NOT APPLY 12 Volts to the supply terminal when the battery link is added. This will damage the transmitter. |
Current Consumption |
Nominal 80mA at 12VDC (Transmitting), 12mA on standby |
Receiving Frequency |
151.6MHz (8 selectable frequencies. See table above). |
Inputs |
4-20mA analog and Normally open contact |
Oscillation System |
VCO with 10ppm crystal controlled reference oscillator |
Operating Temperature |
-5 to 50°C |
Frequency Deviation |
+/- 5 kHz |
Type of Emission |
Narrow Bandwidth Frequency Modulation |
R.F. Output Power |
100mW into 50Ω SO239 socket |
Antenna |
SO239 socket provided. Optimum performance with Elsema ANT151M antenna |
Internal Resistance on Analog Input |
200Ω |
Maximum Current on Analog Input |
25mA |
Coding System |
On board 12 way code switch |
Dimension |
140 X 60 X 34mm |
Mounting Hole Size |
4.76 mm or 3/16” |
Mounting Hole Space |
Length 125mm (4.92”)
Width 45 mm (1.77”) |
Weight |
225 grams |
Useable Operating Range |
Up to 5000m, depending on installation and type of antenna used. Recommended Antenna is Elsema ANT151M |
Compatible Receiver |
RXA15101E or RXA15101 |
Block Diagram
The connection for the analog input is as follows:
Sensor:
The sensor can be any device that will output 4-20mA’s when connected to the TXA15101 analog input. The TXA15101 has an internal 200Ω resistor that has to be accounted for when deciding on what supply is to be used for the sensor. See recommended internal resistor values from your sensors data sheet.
The sensor is usually a device used to monitor tank levels, temperature, humidity, flow rates etc.
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