What it Does:
The AQUASWITCH™ is a special purpose dedicated computer which automatically "changes out" an exhausted DI bank for a fresh, stand-by bank. LEDs continually give the condition of both banks. An alarm output is activated as each bank is depleted.
How it Works:
When the monitor/controller senses poor quality water merely because the DI system has been shut down temporarily, the AQUASWITCH purges the "on-stream" bank until water quality recovers. If the DI bed is exhausted, however, water quality will not improve sufficiently after purging. The AQUASWITCH will then automatically take the exhausted bed out of service and switch over to the stand-by bank. The fresh bank is purged until the desired quality level is reached; it then goes into service.
The purge cycle is controlled by a timer which is easily adjustable for periods from 1-10 minutes. This feature allows the system to be tailored to the requirements of each application, and ensures banks are not switched or shut down prematurely. A "manual change over" button can be depressed to switch banks at any time.
The AQUASWITCH features advanced circuitry, including three solid state (not mechanical) relays to reliably operate the solenoid valves. Three or four solenoid valves suitable for ultrapure water (not supplied) are needed to make a complete AQUASWITCH system.
Two models to choose from:
The standard AQUASWITCH I does not monitor water quality itself, but may be used with any reliable resistivity or conductivity monitor/ controller such as the Myron L 750 Series II. The AQUASWITCH II is an integrated unit with a built in 750 Series II Resistivity or Conductivity Monitor/controller. They are available in several ranges.
Features
- Automatically switches from exhausted to fresh DI bank
- Push-button override for immediate bank change-over
- Adjustable purge timer for "fail-safe" operation
- LEDs continually give status on both DI banks
- Alarm output activated as each bank is depleted
- Advanced circuitry for maximum reliability
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Sensors
AQUASWITCH II models require either a CS-10 or CS51 series sensor. These reliable sensors feature two integral thermistors to ensure accurate and rapid automatic temperature compensation. The sturdy polypropylene standard bushing is modular for easy, inexpensive replacement. A PVDF or 316 stainless steel bushing can also be ordered. The metal portion is available in either 316 stainless steel or titanium.
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AQUASWITCH I Specifications |
| Input Power |
115 VAC, 50/60 Hz ±15% (user changeable to 230 VAC) |
| Output Power to Valves |
User Determined |
| Maximum load per valve output |
200 milliamps
(5 watts for a 24 V valve)
(25 watts for a 115 V valve)
(50 watts for a 230 V valve) |
| Alarm contact |
SPDT 10 amp @ 250 VAC, 30 VDC |
| Maximum Power Consumption |
@ 115 V: 100 mA |
| Dimensions |
6" (152 mm) H x 4.8" (122 mm) W x 3.8" (96 mm) D |
| Construction |
Fully gasketed heavy-duty ABS for splash and corrosion proof protection. Rated IP64/NEMA 3 |
| Ambient Temperature Range |
-32°F (0°C) to 140°F (60°C) |
| Shipping Weight |
3 lbs (1.4 kg) |
AQUASWITCH II Specifications
All specifications same as AQUASWITCH I (above) except: |
| Monitor/controller Range |
Resistivity: 7 ranges; 0-200 KW to 0-20 MW
Conductivity/TDS: 14 ranges from 0-1 µS/ppm to 100 µS/ppm
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| Readout |
3 1/2 digit LCD standard; opt. 3 1/2 digit backlit |
| Accuracy |
+/- 1% of full scale |
| Sensitivity |
.05% of full scale |
| Stability |
.05% of full scale |
| Repeatability |
.1% of full scale |
| Calibration Check |
Built-in |
| Voltage output |
0-10 VDC @ 5 mA max. (linear); standard all models |
| Control Function |
Single Alarm/Control fully adjustable 0-100% of full scale
Hysteresis: Adjustable from 0.3% to 3% of full scale
Indicators: Above (green) and below (red) setpoint LED's (reversible)
Contact Rating: SPDT 10 amp @ 250 VAC, 30 VDC. Relay operates decreasing or increasing reading (selectable) |
| Solid State Output |
Powered; 24 VDC Unregulated 30 mA max. |
| Maximum Power Consumption |
@ 115 V: 250 mA |
| Sensor |
Either CS10 (Resistivity) or CS51/CS51LC (Conductivity) |
| Dimensions |
6" (152 mm) H x 10.8" (275 mm) W x 3.9" (99 mm) D |
| Shipping Weight |
5 lbs (2.3 kg) |
Sensor Specifications |
| Sensor Constant |
Resistivity - CS10 (0.05); Conductivity - CS51LC (0.1) or CS51 (1.0) depending on range |
Temperature
Compensation |
Automatic TC to 25ºC between 32-212º F (0-100ºC) |
| Pressure /Temperature Limits |
100 psi (690 kPa) @ 212ºF (100ºC) |
| Bushing |
Modular polypropylene threaded 3/4" NPT
1/2" PVDF or 316 stainless steel fittings available as options |
| Cable |
Shielded; 10' (3 meters) standard; 25' and 100' (8 and 30 meter) lengths available |
| Dimensions |
Metal portion 1.2" (30 mm) long; 0.5" (13 mm) diameter; Overall length: 3.6" (91 mm) |
| Wetted Materials |
Electrodes - 316 stainless steel (standard) or titanium |
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