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In-Process
The SensaDyne method allows continuous measurement of surface
tension and is directly applicable for continuous in-process measurement
and control. Customers use SensaDyne systems that measure and control
additive levels in plating tanks, detergency levels in cleaning tanks, and
surfactant levels inside polymerization reactors at elevated pressures and
temperatures.
SensaDyne tensiometers require little or no modifications
for process monitoring and process control applications. The most commonly
used configurations are summarized below.
DIRECT ANALOG OUTPUTS
The IP6000, in-process,
on-line, tensiometer has analog outputs available in 0-10 VDC (standard),
and 0-5 VDC or +/-5 VDC (optional) for Fluid Surface Tension and
Temperature. This is accessible from either an external 9 pin D-type
connector on the outside of the enclosure, or internally from a terminal
strip for control wiring run in conduit. This allows direct
access to all available analog signals for process
monitoring and control systems. All the laboratory versions
(QC3000,
QC6000,
PC500-L
and PC500-LV)
can add an optional output board to provide these same analog output
capabilities.
DIGITAL (ALARM) OUTPUTS
TTL level, digital, high and low alarm outputs for Surface Tension and
Temperature are standard on the IP6000
Tensiometer. Upon reaching a user-selected set point (either high or low surface
tension or temperature) the output can turn on an alarm light, or
energize a low voltage relay to implement a digital process control
action. Digital alarm outputs are an optional feature on all
SensaDyne Tensiometers. Similar to analog outputs, the digital output
signals are accessible from a 9 pin D-type connector or terminal strip.
COMMUNICATIONS - DATA ACQUISITION
The IP6000 includes-on
board COM1 and COM2 RS232 serial ports via individual 9 pin D-type connectors.
A link selectable half-duplex RS-485 is available on COM2 as an option.
Included is a data "Receive" software program that
allows data acquisition of current Surface Tension, Temperature, Surface
Age, and Bubble Interval data using a remote computer or laptop.
The IP6000 is a dedicated,
in-process, on-line, instrument with an embedded computer for
process monitoring and process control. It is available in several optional
industrial grade and stainless steel enclosures with various wiring and
output options. The IP6000
is field programmed using a keypad, and process parameters are continuously
displayed on a back-lit LCD display.
The PC1000-R is a dedicated instrument for
in-process and on-line applications in tanks, pressure vessels, reactors or piping systems
with a pressure rating up to 1000 PSI.
EXAMPLE 1:
Detergent concentration for a critical spray washing cycle is controlled by
monitoring the surface tension of the solution.
Detergent makeup feed valves to the holding tank are controlled based on the
direct relationship of surface tension to detergent concentration.
EXAMPLE 2:
Additives levels are controlled in production process plating baths using
surface tension measurement. Iincrease in surface tension is directly proportional to
decrease in additive concentration as the additive is used up, allowing automatic
replenishing of the additive before quality problems arise.
EXAMPLE 3
Surface Tension in a polyvinyl chloride (PVC) production reactor is monitored under high
pressure and temperature, using the
PC1000-R
Tensiometer System. This allows optimum utilization of surfactant in
the polymerization process.