| Measuring Clamp Pressure in Resistance Welding |
In the automotive industry, often the resistance
welding is used to join two pieces of metal together.
This process is especially common in unitized body
construction. In this process, two pieces of metal are
sandwiched together under pressure applied by two
opposing welding electrodes. At a specified
clamping pressure, the electrical charge is applied to
the electrodes welding the two pieces of metal
together.
This clamping pressure is generated by a robotic
hydraulic system. A pressure transmitter
communicates to the system controller to determine
when the appropriate clamping pressure has been
achieved.
A predetermined pressure is set in the control
system. When the pressure transmitter sends a
reading corresponding to this predetermined
pressure, the controller fires the welding system and
a weld is made. |
| Automation Products Group, Inc. incorporates stainless steel sensor in
their pressure product designs to provide a
One Wetted" design which is better able to
stand up to corrosive hydraulic fluids. The APG
digital gauges provide a local digital display of
the pressure. |
| Two-Wire Pressure Transmitter |
|
Accuracy (linearity, hysteresis,
repeatability): ±0.25% F.S. (B.F.S.L.) |
|
High overpressure capability |
|
Hybrid compensation circuit |
|
Zero and span adjustments |
|
|
Applicable Products:
PT-L1, PT-L3, PT-L10, PG-7
|
| High Level Output Pressure Transducer |
|
Accuracy (linearity, hysteresis,
repeatability): ± 0.25% F.S. (B.F.S.L.) |
|
Hybrid compensation circuit for reliability |
|
Compact size and very low weight (3 oz.) |
|
Zero and span adjustments |
|
High overpressure capability |
|
True 0-10 VDC, can cross zero (PT-L3 also has
true 0-5 VDC)
|
|
Self-powered by standard 9 V battery |
|
Large, full 4 digit display with 0.5 in. characters |
|
Keypad operated microprocessor circuit has
"TARE" (auto zero), peak hold and an alarm as
standard functions |
|
Ranges vacuum to 10,000 psi |
|
Direct reading to 9,999 psi |
|
A 16 minute auto off circuit (4 minute with
backlight) |
|
±0.25% of full-scale accuracy
|
|
