Proportion-Air QB1X Installation & Maintenance Instructions Manual

INSTALLATION & MAINTENANCE INSTRUCTIONS
DESCRIPTION / IDENTIFICATION
The QBX series valve uses Proportion-Air closed loop
technology for Pressure control. It gives an output pressure
proportional to an electrical command signal input.
The QB1X is a complete closed loop system consisting of
valves, manifold, housing and electronic controls. Pressure is
controlled by the use of two solenoid valves. One valve
functions as inlet control, the other as exhaust. The pressure
output is measured by a pressure transducer internal to the
QB1X and provides a feedback signal to the electronic
controls. This feedback signal is compared with the command
signal input. A difference between the two signals causes one
of the solenoid valves to open, allowing flow in or out of the
system. Accurate pressure is maintained by controlling these
two valves.
The QB2X is similar to the QB1X but uses a double loop
control scheme. In addition to the internal pressure
transducer, the QB2X receives an electrical signal from an
external sensing device. This primary feedback signal is
compared against the
comparison is then summed with the internal pressure
transducer signal. The gain of the circuit is such that priority is
given to the external feedback signal. A difference between
the command signal and the feedback signal causes one of
the solenoid valves to be activated.
A monitor output is provided for the system measurement. All
QBX valves come standard with an analog voltage monitor
output. QB1X monitor output is an amplified signal from the
internal pressure transducer. QB2X monitor output is a
buffered signal from
connected to the QB2X.
INSTALLATION
1.
Apply a small amount of anaerobic sealant (provided) to the male
threads of the in-line filter supplied with valve.
CAUTION: USE ONLY THE THREAD SEALANT PROVIDED.
OTHER SEALANTS SUCH AS PTFE TAPE AND
PIPE DOPE CAN MIGRATE INTO THE FLUID
SYSTEM CAUSING FAILURES.
2. Install the in-line filter into the port labeled I on QBX valve.
3. For vacuum or vacuum through positive pressure units, the
vacuum supply should be connected to the exhaust port of the
QBX.
4. Connect supply line to the in-line filter port. Connect device
being controlled to port labeled O on QBX valve.
5. For QBX, there are two output ports; one on the size of the
manifold and one on bottom. The working port should be
determined when ordering; check to ensure that the other port is
plugged.
6. Mount valve accordingly.
7. The valve can be mounted in any position without affecting
performance. Mounting bracket QBT-01 (ordered separately)
can be used to attach valve to a panel or wall surface.
8. Proceed with electrical connections.
1
command signal input.
the primary external transducer
Electro-Pneumatic
Pressure Regulator
SPECIFICATIONS
ELECTRICAL
SUPPLY VOLTAGE 15-24 VDC
SUPPLY CURRENT 250 mA
COMMAND SIGNAL 0-10 VDC | 4-20 mA
COMMAND SIGNAL IMPEDANCE VDC=4.75 KΩ | Current=100 Ω
This
MECHANICAL
PRESSURE RANGES Vacuum - 175 psig
OUTPUT PRESSURE† 0-100% of range
Min CLOSED END VOLUME 2 in
FILTRATION RECOMMENDED 20 Micron
LINEARITY/HYSTERESIS <±0.15% F.S. BFSL
PRESSURE TRANSDUCER Silicon, Aluminum
PHYSICAL
OPERATING TEMERPATURE 32-158°F (0-70°C)
PROTECTION RATING IP 65
† Pressure ranges are customer specified. Output pressures other than
100% are available. ‡ Others available
QBX
ANALOGE MONITOR SIGNAL
VOLTAGE 0-10 VDC @ 20 mA max
CURRENT 4-20 mA Sinking (sourcing opt)
(760 mmHg (Vac) - 12 Bar)
FLOW RATE 1.2 SCFM @ 100 psig inlet
(34 L/min @ 6.89 Bar)
Cv CAPACITY 0.04
3
PORT SIZE 1/8" NPT
(included)
REPEATABILITY <±0.02% F.S.
ACCURACY <±0.2% F.S.
‡
WETTED PARTS
ELASTOMERS Fluorocarbon
MANIFOLD Aluminum
VALVES Nickel Plated Brass
WEIGHT 1.02 lb. (0.50 Kg)
HOUSING Aluminum
FINISH Black Anodized
QBX Installation Guide | 5/17/2017 - SSS