AT-67207 — A MURPHY SWICHGAGE
®
* constantly monitors
pressure, level, temperature or load. Adjustable high and low
contacts on SWICHGAGE
®
are set slightly above and below
desired operating point. When demand changes, pointer touches
appropriate high or low contact and signals speed change.
AT-67207 controller responds only so long as contact is made —
Controller stops immediately when contacts separate. Slow,
smooth action prevents “hunting” or “surging” on normal applica-
tions. Stepper kit, listed below, is available for critical applica-
tions.
*Mercury tube or snap-action switches are not suitable for this type
control — A Murphy SWICHGAGE
®
or equal must be used.
Model STR-71204 is offered for applications where slight changes
in engine RPM make significant change is pressure, level, load, ect.
These conditions can be due to close differential requirements, con-
stant speed, automated pumps and/or valves on same line and
where engine and pump are simply oversized for application. The
stepper kit is a solid state device that meters SWICHGAGE
®
signal
to controller in pulses. Both “on” and “off” time periods are inde-pen-
dently adjustable to meet the most critical requirement.
Model STR-71204-N, 12/24 VDC. Negative Ground.
For more information, recommendations and quotations contact
our engineering dept.
The AT-67207 can enhance features of our SELECTRONIC
®
Micro-Controller units by allowing features such as:
1. Warm-up RPM Set point.
2. Minimum RPM Set point.
3. Maximum RPM Set point.
4. Preset Operating RPM Set point.
5. Auto Throttling To Match Flows (AS Needed in Flood Control
Applications).
6. Maintaining System Pressure (As Needed in Booster Station
Application).
7. Adjustable Rate Of Change In RPM (Allowing Fine Tuning Of
Overall System).
For more information, recommendations and quotations contact
our engineering dept.
AT-67207
STR-71204
