Uses twin tower molecular sieve, adsorption system.Description
Environmental Considerations
Operating
230V A.C. 50Hz single phase.
Voltage
2 metre mains lead and plug supplied
(gland at top of equipment).
Current consumption:
-5.9A upon start-up only
-1.8A running current.
Rating plate affixed to equipment.
Temperature
Ambient operating temp. 0 to 38°C (32-100°F).
Dimensions
443mm wide x 1060mm high x 330mm deep.
Installation
Floor standing.
Mass
56kg.
Noise Level
typically 60dBA maximum at 1 metre, all planes.
Operational Features
Compressor
1/3HP rocking single cylinder piston compressor 7 bar(100psi max).
Stop/start pressure 32 – 65 psi.
Minimal transmission of vibration, compressor
fitted via rubber mounts.
Intake filter fitted with replaceable element.
Safety Relief
fitted to compressor to protect dehydrator
Valves
against overpressure (125psi) and downstream of regulator to protect aerial feeder (5psi).
Air Drier
Twin bed heatless pressure – reactivated
adsorption type. Each bed on line 1
min/regenerating 1 min.
Automatic changeover by electro-mechanical
process timer with memory.
Desiccant, grade 4A molecular sieve, 3-5mm.
Inlet and outlet filtration by sintered 35 micron bronze filters at each drier bed port.
Output dewpoint detection circuit with
associated indication and test facilities.
Humidity
Output dewpoint detection circuit with associated Detection indication and test facilities.
Automatic bypass to atmosphere of any
insufficiently dried air. Set to operate at
-20ºC/reset at -25ºC.
“Brown” colour coded humidity sensing element.
Fail safe operation.
Dry Air Storage
Internal welded steel air storage reservoir
Provides a 12.5 litre reserve of dry air.
Safety relief valve set at 102psi with integral ring pull.
Fitted with ¼ turn drain ball valve.
Backup Functionality
Main/Standby
Can be used as a “main” unit operating in conjunction with a “standby” unit easily converted from an existing 12437 or 12447.
Functionality is automatic and distribution from both units to feeders remains independent.
Increases output in high demand situations.
Provides a failure facility whereby if the “main” fails, the “standby” dehydrator supplies dry air to both air storage reservoirs and hence feeders connected to both units.
Quick connect self-sealing sockets are fitted to both units.
One simple 6mm OD flexible tube links the “main” and “standby” units.
Non-return valves prevent role reversal.
Dry Air Output
Pressure
0.5 – 7.0 psi controlled by front panel mounted tamperproof (relieving type) regulator.
Flow
35 ft³/hr (16.5 litres/min) at any set output pressure.
Dewpoint
Better than -40ºC.
Connection
5 or 10 male output bulkhead couplings, intended for 6mm OD flexible hose, situated at the top of the equipment. Each protected by an individual non-return valve to prevent cross-feeding and leakage.
Alarm Indication
Visual
Multi-chip LEDs with current limiting resistors.
Receiver Filling/Dry (Green)
Receiver Not Filling/Wet (Red)
ie output being bypassed to atmosphere.
Running command (Amber) neon
ie compressor should be active.
Low Output pressure (Red neon) adjustable, factory set at approx. 1.0 psi.
High Output pressure (Red neon) adjustable, factory set at approx. 3.5 psi.
High Output Flow (Red) adjustable throughout range of individual output flowmeters
5 or 10 fitted dependent upon number of outlets.
Extended
15 Way “D” type connector provided (at top of equipment) to enable remote indication of alarms; individual (non-commoned) clean contacts rated at 5A being provided as both normally open and normally closed volt free contacts provided for each of:
-
- Mains Fail
- High Humidity (vessel/w.guide not filling)
- Low Output Pressure
- High Output Pressure
- High Output Flow
37 way “D” type connector fitted to provide individual low output (waveguide) pressure alarms both normally open and normally closed (non-commoned) for each flow tube. Each switch is fitted to a tee between the non-return valve and output bulkhead coupling. The switches are adjustable throughout the range 0.4 – 1.0psi, factory set just below 1.0psi
Monitoring/Control
Electrical
Combined on/off switch/lamp and circuit breaker incorporating thermal protection rated at 10A.
Total running hour meter to indicate compressor
usage, permanent LCD display.
LOW output pressure alarm lamp.
HIGH output pressure alarm lamp.
Receiver FILLING lamp.
Receiver NOT FILLING lamp.
High Output Flow lamps (one per outlet).
RUNNING COMMAND lamp indicating when
compressor should be running.
Pneumatic
63mm dia. “Compressor” pressure gauge 0-150psi (liquid filled).
63mm dia. “Receiver” pressure gauge 0-160psi.
63mm dia. “Output” pressure gauge 0-15 psi.
Individual flow indicators 0-350 litres/hour (5 or 10) with “toggle” type stop valves to display instantly whether in the open or closed position.
Tamperproof precision output regulator to adjust output pressure 0.5 – 7.0psi (accurate within 10mbar over operational range of equipment).
Non-return valve fitted to each output to prevent cross-feeding.
Test Facilities
Element Check
A momentary pushbutton switch introduces un-dried compressor air to the sensing element to check operation of the humidity sensor.
Circuit Check
“Wet” and “Dry” circuit check pushbuttons to
electrically test humidity detector circuitry.
Tester Humidity Detector 1A compatible via test jack sockets located internally.
Override
Momentary pushbutton enabling the compressor to run continuously so that, for example, tests may be carried out on the humidity detector without waiting for receiver pressure to drop.
