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What is an MDR?
An MDR is an electric flow control device having one or more poles that contain metallic mercury and a plunger which, when energized by a magnetic field, moves into a pool of mercury, displacing the mercury sufficiently to create a closed electrical circuit.

Because mercury disposal is a significant environmental issue, Watlow developed a procedure for properly disposing of Mercury Displacement Relays (MDR's). By returning the MDR to Watlow's facility in Winona, Minnesota, the MDR product team will facilitate the proper disposal of the unit free of charge.

Watlow recognizes the risk that spent mercury poses to the environment and realizes the importance of having an effective, proactive disposal procedure in place. If eliminating mercury from your equipment is a concern, Watlow has made the disposal procedure safe, easy and best of all, free.


Disposal Procedure
MDR's must not be placed in the waste stream until the mercury is removed and reused or recycled.
Customers needing to dispose of their Watlow MDR's should follow these procedures:

1: Please contact Watlow Controls at 507-454-5300 to establish an account and obtain authorization to return the MDR.

2: MDR's may be returned for disposal to:
     Watlow Controls
     1241 Bundy Blvd.
     Winona, Minnesota
     USA  55987

3: Watlow will send the returned MDR's to a consolidator or recycler, who will remove and recycle the mercury and all other parts of the MDR that are recyclable or reusable. Watlow will pay for the cost of collecting and disposing of the MDR's made or marketed by Watlow.

MDR's eligible for this service are Watlow Series A, H, HG, KD, L, LD, M, and MD relays.

Hazardous Materials:
If the MDR to be returned has one or more breached (open) poles, it must be sealed in a non-porous container to prevent the escape of liquid and gaseous mercury. Acceptable non-porous containers are composed of high density polyethylene, or equivalent.

Watlow recommends the relay (s) be double-bagged in sealed Zip-Lock-type storage bags and further sealed with heavy duty packaging tape. Please ship the unit with adequate packing material in a corrugated cardboard box (minimum burst strength of 200 pounds). Breached relays must be shipped as hazardous material.
Please include the following information on the hazardous material shipping label:

  • Proper shipping name: Mercury contained in manufactured articles
  • Emergency contact number: 800-800-2385 (Dynex Environmental Services)
  • Hazard Class or Division: 8
  • Identification Number: UN2809
  • Packing Group: 1
  • Type Label's) and required information: Corrosive

Watlow encourages proper disposal of MDR's. Complying with this procedure makes the process hassle-free and helps protect the environment.

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