Miller Edge MWT12 Sensing Edge Transmitter, RF in NEMA 4 Enclosure
The Miller Edge MWT12 is a wireless sensing edge transmitter for legacy Miller Edge MW 318 MHz systems. It connects to a compatible 2-wire non-monitored sensing edge and transmits the activation signal to a Miller Edge receiver such as MWR12 or MWR13.
This transmitter is commonly used on automated gates and commercial motorized doors where a moving edge needs wireless communication to the operator controls. It is not a stand-alone safety edge and it is not a gate remote transmitter. The receiver, edge, DIP switch code, and operator safety input all need to match.
Features and Specifications
| Manufacturer | Miller Edge |
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| Part Number | MWT12 |
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| Product Type | Wireless sensing edge transmitter |
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| Application | Wireless signal from 2-wire non-monitored sensing edge to compatible Miller Edge MW receiver |
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| Frequency | 318 MHz |
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| Transmitter Input | 2-wire N.O. non-monitored sensing edge |
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| Battery Type | AA batteries; verify exact chemistry by transmitter label and instructions |
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| Enclosure Rating | NEMA 4 |
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| Operating Range | Up to 100 ft under optimal conditions when paired with compatible receiver |
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| Operating Temperature | 0 F to 130 F |
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| Dimensions | Approx. 1-13/16 in. W x 5-3/4 in. H x 1-3/4 in. D |
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| Weight | Approx. 7.2 oz. |
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| Low Battery Alarm | No built-in audible alarm on MWT12; use MWTA12 where alarm feature is required |
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| Notes | Legacy / discontinued transmitter; verify generation and DIP switch style |
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Compatible With
- Miller Edge 318 MHz MW wireless sensing edge systems.
- Commercial motorized door operators using a non-monitored safety edge input.
- Automated vehicular gate operators using a non-monitored safety edge input.
- Older commercial door operators manufactured before August 2010 when a non-monitored edge system is allowed by the operator and site requirements.
- Older automated gate operators manufactured before January 2016 when a non-monitored edge system is allowed by the operator and site requirements.
- Miller Edge 2-wire, non-monitored, normally open sensing edges, sold separately.
- Applications requiring dry contact N.O. or N.C. receiver output to the operator control board.
- Not intended as a substitute for a monitored sensing edge system where monitored entrapment protection is required.
- MWR12 single-channel 318 MHz receiver.
- MWR13 three-channel 318 MHz receiver.
- MWRT12 single-channel wireless edge kit.
- MWRTA12 systems when replacing only transmitter type must be verified; MWTA12 is the alarm version.
- Pre-April 2024 trinary 9-pole, 3-position DIP switch Miller Edge MW systems.
- Current binary B-series components may require additional programming when mixed with legacy MWT12 components.
Also Known As / Related Part Numbers
- MWT12
- MWT-12
- MWT 12
- Miller Edge wireless edge transmitter
- Miller Edge 318 MHz transmitter
- MWRT12 transmitter
- MWR13 transmitter
- Legacy trinary MWT12
- MWT12B related current transmitter
- MWTA12 related alarm transmitter
Technician Note
If the receiver powers up but does not respond, check the MWT12 batteries, edge connection, test button, DIP switch code, and antenna placement before replacing parts. A failed or water-damaged sensing edge can look like a transmitter problem.
Before Ordering
- Match the Miller Edge wireless generation: pre-April 2024 trinary DIP components and current binary DIP components may require additional programming when mixed.
- Verify the job requires a non-monitored 2-wire sensing edge system, not a monitored edge interface.
- Confirm the operator provides 12-24 VAC/DC low-voltage power for the receiver.
- Confirm the receiver output needed by the operator: normally open or normally closed.
- Keep the receiver antenna outside metal enclosures or use the proper remote antenna accessory if signal range is weak.
- Check all safety devices after installation and test that the door or gate stops and reverses properly.
- Confirm whether the installation needs MWT12 or MWTA12 with low battery alarm.
- Verify the edge is a 2-wire non-monitored normally open style compatible with the transmitter input.
- Check the existing transmitter label for legacy MWT12 versus current MWT12B.
Professional Advisory
Wireless edge systems must be installed and tested as safety devices, not as simple accessory relays. For high-voltage operator panels, monitored safety requirements, missing entrapment protection, or unreliable gate movement, use a qualified gate or commercial door technician.
Product Questions and Answers
What receiver does the MWT12 work with?
MWT12 is commonly used with Miller Edge MWR12 single-channel and MWR13 three-channel 318 MHz receivers when the generation and coding are matched.
Is MWT12 a gate remote control?
No. MWT12 is a wireless sensing edge transmitter, not a user remote for opening a gate or garage door.
What type of sensing edge connects to MWT12?
MWT12 is intended for a 2-wire normally open non-monitored sensing edge.
Does MWT12 have a low battery alarm?
No. The standard MWT12 does not have the audible low battery alarm. The related MWTA12 transmitter includes that alarm feature.
Can MWT12 be mixed with B-series MW parts?
Miller Edge notes that binary and trinary MW parts may be interchangeable with additional programming. Verify instructions and part generation before mixing MWT12 with B-series components.
