Proportion-Air QBS Series Installation & Maintenance Instructions Manual

INSTALLATION & MAINTENANCE INSTRUCTIONS

DESCRIPTION / IDENTIFICATION

The QBS stainless steel series valve uses Proportion- Air closed
loop technology for Pressure control. It gives an output pressure
proportional to an electrical command signal input.
The QB1 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 an
internal pressure transducer 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.
The QB2 is similar to the QB1 but uses a second feedback loop. In
addition to the internal pressure transducer, the QB2 receives an
electrical signal from an external sensing device. This primary
feedback signal is compared against the command signal input. This
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 QB
valves come standard with an analog voltage monitor output. QB1
monitor output is an amplified signal from the internal pressure
transducer. QB2 monitor output is a buffered signal from the primary
external transducer connected to the QB2.
Before you get started, please read these warnings

Examine the product. Ensure that you received what you ordered.

Read this guide first before you start and save it for later use.

You must have a good understanding of what the adjustments are on
this product before using them.

All compressed air and power should be shut off before installing,
removing or performing maintenance on this product.

Installation and use of this product should be under the supervision and
control of properly qualified personnel in order to avoid the risk of injury
or death.

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 IN on QB 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 OUT on QB valve.
5. Mount valve accordingly.
6. 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.
7. Proceed with electrical connections.
1
QBS
with SS Manifold
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
VOLTAGE MONITOR SIGNAL 0-10 VDC @ 20 mA
CURRENT MONITOR SIGNAL 4-20 mA Sinking (sourcing opt)
MECHANICAL
PRESSURE RANGES Full Vacuum - 500 psig
OUTPUT PRESSURE† 0-100% of range
FLOW RATE 1.2 SCFM @ 100 psig inlet
Cv CAPACITY 0.04
Min CLOSED END VOLUME 1 in
PORT SIZE 1/8" NPT
FILTRATION RECOMMENDED 20 Micron
LINEARITY/HYSTERESIS ±0.2% F.S. BFSL
REPEATABILITY ±0.05% F.S.
ACCURACY ±0.25% F.S.
WETTED PARTS
ELASTOMERS Fluorocarbon
MANIFOLD Stainless Steel or Aluminum
VALVES Nickel Plated Brass
PRESSURE TRANSDUCER Stainless Steel
PHYSICAL
OPERATING TEMERPATURE 32-158°F (0-70°C)
WEIGHT 1.4 lb. (0.64 kg)
PROTECTION RATING NEMA 4
HOUSING Aluminum
† Pressure ranges are customer specified. Output pressures other than
100% are available. ‡ Others available
(760 mmHg (Vac) - 34 Bar)
(34 L/min @ 6.89 Bar)
3
(included)
‡
FINISH Black Anodized
QBS Installation Guide | 4/11/2016 - SSS