|
GENERAL
Chemical metering pumps shall be positive
displacement, Liquifram™ type pumps that are
UL and CUL approved. Output volume shall be
adjustable while pumps are in operation from
zero to maximum capacity of:
|
A17, A77, A97 |
0.42 GPH |
( 1.6 liters per hour ) |
|
A14, A74, A94 |
0.58 GPH |
( 2.2 liters per hour ) |
|
AA18, AA78 |
0.75 GPH |
( 2.8 liters per hour ) |
|
AA15,AA75,AA95 |
1.0 GPH |
( 3.8 liters per hour ) |
|
A16, A76, A96 |
2.0 GPH |
( 7.6 liters per hour ) |
Chemical metering pumps shall be capable,
without a hydraulically backed diaphragm, of
injecting solutions against pressures up to:
|
AA14,AA74,AA94 |
250 psig |
17.3 bar |
|
AA17,AA77,AA97 |
140 psig |
9.7 bar |
|
AA15,AA75,AA95 |
110 psig |
7.6 bar |
|
AA18,AA78 |
80 psig |
5.5 bar |
|
AA16,AA76,AA96 |
50psig |
3.5 bar |
SERIES A1
Adjustment shall be by means of readily
accessible dial knobs, one for changing
stroke length and the other for changing
stroke frequency. Both knobs are to be
located opposite the liquid handling end.
On-off switch shall be integral with
frequency control, "off" position to be
below lowest frequency setting.
SERIES A7
Control of Series A7 metering pumps shall be
selectable between internal and external
pulsing by means of a switch integral with
frequency control knob. "External" position
to be below lowest internally paced
frequency setting. Stroke length shall be
adjustable by means of readily accessible
dial knob. When in external pulsed mode,
Series A7 units shall accept signals without
the use of electrical timer or internal
timer.
SERIES A9
Series A9 metering pumps shall have a clear
liquid crystal display. Control shall be
selectable between internal and external
pulsing by means of a
means of a tactile keypad. Internal stroke
frequency shall be adjustable from 1 stroke
per hour to 100 strokes per minute. Pressure
capacity shall be keypad adjustable to
reduce noise, vibration and wear. Metering
pump shall be capable of dividing or
multiplying pulse inputs from 1 to 999 or
responding directly or inversely to a 4-20mA
input signal. |
DRIVE
The pump drive shall be totally enclosed
with no exposed moving parts. Solid state
electronic pulser shall be fully
encapsulated and supplied with quick connect
terminals at least 3/16" (4.75 mm) wide.
Electronics shall be housed in chemical
resistant enclosure at the rear of the pump
for maximum protection against chemical
spillage. Electrical power consumption shall
not exceed 22 watts per hour under full
speed and maximum pressure conditions. Pump
weight shall not exceed 14 lbs (6.5 kg).
AUTOMATIC PRESSURE RELIEF
To
eliminate need for pressure relief valve,
LiquiframTM shall automatically stop
pulsating when discharge pressure exceeds
pump pressure rating by not more than 35%.
MATERIAL
Chemical metering pump housing shall be of
chemically resistant glass fiber reinforced
thermoplastic. All exposed fasteners shall
be stainless steel. Chemical metering pump
valves shall be ball type, with ceramic
balls1. Valve seat and seal ring shall be
renewable by replacing the combination
seat-seal ring2 or cartridge valve assembly.
Pump head shall be of transparent acrylic3
material capable of resisting the pumped
chemical. Fittings and connections at pump
head shall be PVC4.
CHECK VALVES AND TUBING
A total of 16 ft
(4.8 m) of polyethylene tubing5 shall be
provided per pump complete with compression
connections. A foot valve with integral one
piece strainer shall be provided for the
suction line, and an injection check/back
pressure6 valve with ½" NPT male connection
for the injection point. The injection check
valve shall incorporate a dilating orifice
which prohibits scale formation and
accumulation of crystalline deposits.
Series A Pump Size
Specifcations |
