| Adjustable
Deadband |
Fixed
Deadband |
| Fully
Automatic, Double Adjustments |
Fully
Automatic, Single Adjustments |
| TYPE
DA |
TYPE
DS |
| |
| 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. |
| |
|
| See
Picture of Mercury Switch Contact
with Double External Adjustment. |
See
Picture of Mercury Switch Contact
with Single External Adjustment. |
| See
Picture of Snap Action Switch Contact
with Double External Adjustment. |
See
Picture of Snap Action Switch Contact
with Single External Adjustment. |
| |
| Semi-Automatic |
Semi-Automatic |
| Manual
Reset, Single Adjustments |
Manual
Lock Reset, Single Adjustments |
| TYPE
DR |
TYPE
DL |
| |
| 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. |
| |
|
| See
Picture of Manual Reset Model |
See
Picture of Manual Lock Model |
