Industrial Applications
Vehicle Test
The CR7’s wide operating range (-40° to +70°C, extended), portabil-
ity, ruggedness, and expandability make it a useful tool in vehicle
testing applications. In automobiles, locomotives, tractors, heli-
copters, and other vehicles, the CR7 can measure temperature,
pressure, velocity, acceleration, engine RPM, force, displacement,
and electrical system load.
Most sensors can be connected directly to the CR7 without the use
of external signal conditioning. The CR7 is also SDM-OBDII
compatible allowing the user to monitor, record, and compare data
from the vehicle’s onboard computer with the CR7’s sensors.
The CR7 is typically housed in an ENC 7F enclosure and interfaced
to the DSP4 Heads Up Display for real-time display. The
SM192/716 Storage Modules or CSM1 Card Storage Module
provide additional data storage. Real-time data can be downloaded
via cellular phone or RF link.
HVAC & Utilities
Measured parameters include:
• Voltage
• Current
• Power
• Temperature
• Relative humidity
• Pressure
• Flow
The CR7 is usually panel-
mounted in a NEMA enclosure.
HVAC applications typically
require input/output channel
expandability. Options include:
• 720XL I/O modules
• AM416 multiplexers
• Up to four remote I/O
modules
Remote I/O modules or multi-
plexers can greatly simplify cabling from remote sensor arrays by
sending data or signals over a few common lines.
Process Control
The CR7 can monitor ongoing production allowing operators to
discard items that don’t meet specifications. Real-time measure-
ments can be displayed for operators and stored for review by
quality control personnel. Both product and assembly line status
can be monitored simultaneously, providing on-line quality control
while minimizing production downtime.
Process and control applications include:
• Maintaining oven/dryer temperature
• Monitoring conveyor/belt speed
• Sounding alarms for out-of-specification conditions or
equipment malfunction
• Maintaining liquid or gas levels
Thermocouples
The CR7’s input offset error of less than 100 nV allows inexpensive
thermocouples to be used for precision temperature measurements.
Type T, E, K, J, S, R, and B thermocouples connect directly to a 723
or 723T card; the signal voltage is then linearized relative to a
user-specified reference junction. Measurements of type E thermo-
couples can be resolved to 0.001°C at throughput rates of 20
channels per second, 0.0125°C at 100 channels per second.
RTDs, Strain Gage Pressure Transducers and Load Cells
Strain gages and RTDs are measured as the ratio of bridge signal to
excitation voltage. Consecutive measurements with reversed exci-
tation polarity eliminate errors due to thermal emfs in connectors
and sensor junctions. The CR7’s measurement precision allows
bridge excitations to be reduced, eliminating self-heating errors
(e.g., a 100 ohm RTD with a 0.5 mA excitation current resolves to
within 0.00025°C at 15°C).
Measurement Examples
Above: The CR7 displays and
stores vehicle test data from a
prototype Aston Martin DB7.
Left: Closeup of ENC 7F modified
with custom connectors. Photos
courtesy of Aston Martin, Ltd.
Systems can monitor and control
pumps, fans, and starter motors.
Proportional control of dampers is
also possible.
One CR7 can measure large numbers of flow meters, LVDTs, pressure
transducers, thermocouples, strain gages, and accelerometers.
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