> Interpretation of Process Pressure Gauges on Temperature Control Units
Interpretation of Process Pressure Gauges In Temperature Control Units
Read Available Water Pressure at Unit's Location
When the Sentra is attached to process to be controlled, with power on, water supply on, pump off, both gauges will read the
water supply pressure at the unit’s location.
Read Pressure Drop Across the Process with Δ P
With pump on, the to process gauge will rise to read the sum of the water supply pressure and pump generated pressure.
The from process gauge reads the effect of water supply pressure and pump suction pressure. The difference between the to
and from process gauges is the pump generated circulating pressure, which is also equal to the pressure drop across the process.
Pump Rotation Indication
If the pump is running, and both gauges are “close” to same value, chances are that the pump is rotating backward, or the pump
is generating such a high flow that an overload condition will result.
Water Hammer (on competitive Solenoid Valve Units)
On competitive mold temperature controllers, when the Δ P gauges are supplied, the water hammer effect of on/off solenoid valves can be
seen. At valve open, both to and from process gauges will fall as the system depressurizes. When the valve closes, there will be a
momentary spike that will be seen on both gauges, then they will settle back to normal the Δ P values. This spike is water hammer.
Pump Motor Overload Condition
If the Δ P is low with pump rotating correctly, then the flow rate is high, which probably will result in a motor overload.
Refer to the representative pump curve below.
Would you like to Download FYI #001 to your browser?
Need Application Assistance?
Our Experienced Team Can Save You Time & Money.
Tell Us About Your Project
In Business since 1977
Advantage Engineering, Inc. 525 East Stop 18 Road Greenwood, IN 46143 317-887-0729
Privacy Statement: we will not sell, rent or release any personal information you share with us to third party vendors.
Product innovation and improvement is our constant goal. All features, specifications and pricing are subject to change without notice or liability.