Select Your Mercoid Series-D Operating Requirements
Please choose from the following choices.
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| TYPE DA | TYPE DS |
| Adjustable Deadband | Fixed Deadband |
| Fully Automatic, Double Adjustments | Fully Automatic, Single Adjustments |
| Equipped with two external adjustments, one for setting high pressure operating point, the other for setting low pressure operating point. Deadband, or the difference between high and low set points, is adjustable over full scale. Mercoid’s most popular operating mode, available on most Series D pressure and temperature controls. |
Equipped with single adjustment for setting operating point only. A single pointer on scale sets pressure point at which switch action occurs. Fixed deadband is factory set and cannot be altered in the field. Furnished standard for Series D-200 and D-7200, also available on Series D-20, D-30, D-35, D-40, D-80, D-500, and D-900 pressure and temperature controls. |
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| TYPE DR | TYPE DL |
| Semi-Automatic | Semi-Automatic |
| Manual Reset, Single Adjustments | Manual Lock Reset, Single Adjustments |
| Equipped with a single adjustment for setting operating point to operate the circuit automatically upon a pressure increase or decrease. Push button reset must be operated External manually to restore the circuit to Adjustment original position after automatic operation. Suffix “L,” i.e. DR-31-153L denotes control will operate automatically on increase; suffix “U” denotes control will operate automatically on decrease. Available on Series D-20, D-30, D-35, D-40, D-80,D-500, D-900, and D-7000 pressureand temperature controls. | Equipped with a single adjustment for setting operating point. Control will operate at set point only upon a decrease in pressure. Manual lock feature permits circuit to be reset and locked in position. Lock remains in effect until pressure rises above control setting. Lock then releases and circuit is held in reset position until further automatic operation upon pressure decrease. Available on Series D-20, D-30, D-35, D-40, D-80, and D-900 pressure and temperature controls. |