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Frequently
Asked Questions
Pressure
Calibrator Modules
Q:
How many pressures must be applied
to the calibrator. Answer
Q:
How accurate must the control and servo
pressures be? Answer
Q:
What quality of air must be applied
to the calibrators? Answer
Q:
My calibrator oscillates, what
do I do? Answer
Q:
I cannot communicate with my calibrator.
Answer
Q:
How often should I calibrate the pressure
module? Answer
How
many pressures must be applied to the calibrator?
All servo operated calibrators require a nominal
90 psi supply to operate the internal valves.
The Servo operates from a separate servo pressure
supply.
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How
accurate must the control and servo pressures
be?
The control supply may be 85 to 105 psi depending
on the full scale pressure range of the module.
The servo supply must be 3 to 10 psi greater than
the full scale range of the module. The servo
supply must be very well regulated.
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What
quality of air must be applied to the calibrators?
In order to prevent damage to the valves and secondary
standard, the control and servo pressures must
be AInstrument Grade@. For more information, please
refer to ISA Specification ISA-S7-3.
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My
calibrator oscillates, what do I do?
The stability of a Servo operated pressure calibrator
depends upon the servo supply input and the volume
connected to the output of the calibrator. All
servo operated calibrators are tuned at the Scanivalve
Factory prior to shipment. Unless the customer
installation exactly matches the Scanivalve Factory
air supply, the modules may have to be re-tuned
prior to use. The modules may be re-tuned by executing
a TUNE command.
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I
cannot communicate with my calibrator.
All calibrators communicate with a Scanivalve
Pressure Measurement System or Host computer using
a RS-232 connection. The settings are: 9600 BAUD,
8 data bits, 1 stop bit, no parity. All calibrators
are designed to be used in systems with multiple
calibrators in a daisy chain configuration. Each
calibrator has a unique address from 1 to 9. Commands
to the calibrator must be preceded by the calibrator
address. All calibrators shipped from the Scanivalve
Factory have the address set to 1 unless the calibrator
is part of a larger system. The address may be
changed by a user by changing the setting of ADDR.
For more information consult the Calibrator manual
or contact Scanivalve Corp, Product Support Dept.
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How
often should I calibrate the pressure module?
Calibrators with Mensor Secondary Standards DSA
modules should be re-calibrated at a six month
interval for the best accuracy. Calibrators with
a Digiquartz Secondary Standard should be re-calibrated
at six month intervals for the first year. Generally
after the first year the calibration interval
of Digiquartz Secondary Standards may be extended
to one year.
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