Miller Edge MWTA12 Sensing Edge Transmitter with Low Battery Alarm Technical Details
The Miller Edge MWTA12 is a legacy wireless sensing edge transmitter with a built-in low battery alarm for non-monitored 2-wire edge systems. It mounts at the moving edge and sends the edge activation signal to a compatible Miller Edge MW receiver, helping avoid exposed hardwire runs, cord reels, or coil cords where a wireless edge connection is appropriate. This part belongs to the older 318 MHz MW wireless platform and should be matched carefully by receiver model and coding generation. It is not a monitored edge transmitter and should not be substituted for a monitored UL325 wireless safety system without verifying the operator and site requirements.
Compatibility and Application Notes
- Compatible with legacy Miller Edge MW 318 MHz non-monitored wireless edge systems when the receiver and transmitter coding generation match.
- Commonly associated with MWR12 single-channel receiver systems and MWRTA12 transmitter/receiver kit configurations that use the MWTA12 transmitter with low battery alarm.
- Compatible with MWR13 three-channel receiver systems where the MWR13 is paired with 2 to 3 MWT12 or MWTA12 transmitters.
- Used with 2-wire N.O. non-monitored sensing edges connected to the MWTA12 transmitter input.
- Common applications include commercial motorized doors and automated vehicular gates where the operator accepts a non-monitored wireless edge receiver output.
- Related legacy models include MWT12 transmitter without alarm, MWTA12 transmitter with alarm, MWR12 receiver, MWR13 receiver, MWRT12 kit, and MWRTA12 kit.
- Important generation note: Miller Edge lists older MWR12, MWR13, MWRT12, MWRTA12, MWT12, and MWTA12 trinary-code components as discontinued, with current B-series models using a 2-position binary coding switch. Do not mix generations without confirming compatibility.
- Not for monitored RBand systems, monitored edge inputs, or any safety circuit where a monitored transmitter is required.
Features and Specifications
| Manufacturer | Miller Edge |
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| Part Number | MWTA12 |
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| Product Type | Wireless sensing edge transmitter with low battery alarm |
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| Wireless Family | Legacy MW wireless edge system |
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| Configuration | Non-monitored |
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| Frequency | 318 MHz |
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| Input | 2-wire N.O. sensing edge |
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| Compatible Receiver Families | Legacy MWR12 single-channel and MWR13 three-channel MW receivers when generation and coding match |
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| Operating Range | Up to 100 ft under optimal conditions |
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| Response Time | 30 milliseconds |
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| Battery | (2) 1.5 volt AA lithium batteries, 2-year expectancy |
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| Low Battery Alert | Audible alarm, approximately 80-95 dB at 2 ft |
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| Dimensions | 1-13/16 in. W x 5-3/4 in. H x 2-1/8 in. D |
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| Weight | 7.2 oz |
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| Enclosure Material | Polycarbonate |
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| Degree of Protection | NEMA 4 |
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| Notes | Older trinary-code generation; verify against receiver before ordering |
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Also Known As / Related Part Numbers
- MWTA12
- MWTA-12
- MWTA 12
- MWTA12 transmitter
- Miller Edge MWTA12 transmitter with alarm
- MWT12 related transmitter without alarm
- MWR12 receiver
- MWR13 receiver
- MWRT12 kit
- MWRTA12 kit
- MWTA12B current-generation related model
- MWT12B related current-generation transmitter
- MWR22B related current-generation receiver
Technician Note
The main ordering risk with MWTA12 is generation mismatch. Older MWTA12 transmitters used the legacy 3-position trinary coding style, while current B-series MW products use a 2-position binary coding switch. Match the receiver, transmitter, and coding style before treating parts as interchangeable.
Before Ordering Checklist
- Confirm the receiver model number on site, such as MWR12 or MWR13, before ordering the transmitter.
- Verify the system is non-monitored and uses a 2-wire N.O. sensing edge input to the transmitter.
- Check whether the existing transmitter is legacy MWTA12 or current MWTA12B before mixing components.
- Confirm the operator accepts the receiver output and does not require a monitored wireless edge device.
- Inspect the edge cable, transmitter enclosure, batteries, and receiver antenna before replacing only the transmitter.
Professional Advisory
Wireless safety edge systems must be tested after programming and battery replacement. Do not jumper the receiver output or defeat an entrapment protection input to make the operator run. If the site uses a monitored safety circuit or current UL325 monitored edge requirements apply, have a qualified gate or door technician verify the proper monitored device.
Product Questions and Answers
What receiver works with the Miller Edge MWTA12 transmitter?
The MWTA12 is commonly associated with legacy Miller Edge 318 MHz MW wireless systems, including MWR12 single-channel receiver setups and MWR13 three-channel receiver setups. Match the transmitter and receiver generation before ordering.
Is the MWTA12 a monitored wireless edge transmitter?
No. The MWTA12 is for 2-wire non-monitored sensing edge applications. It should not be used to bypass a monitored safety input or replace a monitored transmitter without confirming operator requirements.
What is the low battery alarm on the MWTA12?
The MWTA12 includes an audible low battery alarm. It is a battery warning feature and is not intended to sound every time the edge is activated.
What frequency does the MWTA12 system use?
Legacy MWTA12 wireless edge systems operate at 318 MHz. Verify the receiver model and generation because newer B-series MW components use updated coding hardware.
Can an MWTA12 be mixed with MWTA12B or MWT12B components?
Do not assume old and new generations are interchangeable. Miller Edge changed the MW system coding style in 2024, so the receiver and transmitter generation must be confirmed before mixing components.
