Chapter 5
SAFETY FEATURES
[93]
6.
Place the compression ring on top of the safety rupture disk, then screw in the locking
fitting. The compression ring is symmetrical, so it can be installed with either side down.
7.
Screw the fitting finger tight and then use a torque wrench to tighten it to the torque
specified on the metal tag attached to the disk. The torque depends on the pressure rating
of the safety rupture disk.
The safety rupture disk assembly is now ready to be re–installed in the pump system. Be sure to also
re-install tubing into the fitting of the relief fluid exit and plumb it to an appropriate receptacle.
The Spare Parts Kit included with each pump system includes one replacement safety rupture disk.
Additional safety rupture disks are available in stainless steel or Hastelloy and may be obtained from
Chandler Engineering. The safety rupture disk’s type and model number is printed on the tag that is
attached to it.
11.6 Calibrating the Pressure Transducers
The pressure transducers on the 5000 Series Pump System need to be recalibrated periodically. During
normal use they should be recalibrated every 12 months. If usage is heavy, or if the pump has been
subjected to unusual circumstances such as pressures above its rated pressure range, then recalibration
should be performed. Also, pressure transducers should be recalibrated after being taken apart and put
back together.
Calibration keeps the two individual pressure transducers (on two pump cylinders used as a pair)
reading the correct pressure. The pump controller uses these pressures to match the standby pump
cylinder’s pressure to the active pump cylinder’s pressure to eliminate pressure variations at switchover.
If the two pressure transducers are not matched to each other, than the pressure in one pump cylinder
will not be the same as the pressure in the other pump cylinder, even though the readings on the display
will match. The easiest way to check if the pump cylinders are matched is to use one pump cylinder to
pressurize both pressure transducers (connect pump cylinders together) and record the pressure of both
pressure transducers over the pressure range of interest.
11.6.1
What is a Pressure Transducer?
A pressure transducer is a device that converts a pressure to an electrical signal proportional to that
pressure. In the CMD-5000 Series controller, the signal generated by the pressure transducer is sent
directly to an A/D (analog-to-digital) converter which converts the analog electrical signal of the
amplifier to a 20-bit digital signal that is displayed on the computer.
Each individual pressure transducer will have slight variations in zero pressure output voltage (zero
offset) and its output voltage at full pressure (gain). In the 5000 Series Pump System these variations
are compensated for in the controller firmware. The process of adjusting the offset and gain
compensation values is called calibration.
11.6.2
Methods of Calibrating the Pump System
There are two basic methods of pressure calibration for all Quizix Pump Systems. The first method
is to attach a secondary calibrated gauge, such as a quartz transducer, to the system. With this
method, the pressure for the calibration procedure will be generated by the Quizix pump. Then the
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