Partech Products ASLD 2200 Sludge Blanket Monitor
ASLD 2200
Automatic Sludge Blanket Level Monitoring
The ASLD 2200 is a fully automatic sludge blanket level detector primarily designed for the water and waste water industry but could be applied to other types of process. It utilises a servo-driven
sensor which continually tracks the settled interface and produces a 4-20 mA output which is proportional to the depth of the blanket. The ASLD 2200 is supplied with either a Infrared or Soli-Tech
20v2 sensor. The use of infrared attenuation as the principle of operation for the sensor allows Partech to ensure sufficient sensitivity to monitor sludge blankets in a wide variety of applications.
It should be noted that sensor selection can be site dependent, Partech are happy to provide full support in the selection of the correct sensor.

The sensor will normally be in the area of the tank just above the sludge and will therefore be kept away from the worst of the fouling that can occur in the treatment of either potable or dirty
water. Provision must be made for transmission of the output signal to the control system; this is normally possible via spare slip rings. Where this is not possible a radio telemetry option is available,
allowing transmission directly to the control system without the need for installation of cables.
For information our Sludge Blanket sensors go to the sludge blanket sensor page.
Technical Specification
Physical
| Dimensions | 490 x 350 x 382 mm (HxWxD) |
| Weight | 15 kg |
| Protection Class | IP55 Outer Enclosure with IP65 Electronics Housing |
| Enclosure Material | GRP Outer with Polycarbonate Inner |
| Cable Entries | 3 x PG11 (cable 5 to 10 mm) |
| Cable Size | Max Conductor Size 2.5 mm² |
Electrical
| Power Supply | 115/230VAC, +10/-15% Field Selectable |
| Power Consumption | 25VA |
| Fuse | 1A |
Environmental Data
| Operating Temperature | Electronics 0 to 50ºC |
| Storage Temperature | Electronics 0 to 50ºC |
| Location | Indoor or Outdoor |
User Interface
| Display | 3 Digit , 7 Segment LED Display of 0-100% |
| Setup | Potentiometer and Push Buttons on main PCBA |
| Units of Measurement | %age Depth |
Output Signals
| Analogue Output | 4-20 mA, maximum load 500 ohm |
| Relay | 1, this alarms at 0 and 100% and is not adjustable |
| Contacts | Contact Closure, 0.5 A @100VDC |
| Local Annunciation | 6 LED's on main PCBA |
Measurement Characteristics
| Response Time | 5 second delay, tracks blanket at 1 metre per minute |
| Accuracy | Typically +/- 5% FSD |
| Resolution | +/- 100mm |
| Measurement Principle | Light Attenuation |
| Depth Range | 0 to 1.5 to 0-20 metres |
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