Sludge Concentration Meter (MLSS Meter) CSS-250

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Overview

In addition to employing a measurement system that is resistant to soiling, the CSS-250 sludge concentration meter employs a new technology for the first time in the industry for containing a cleaning mechanism inside the probe. This makes it possible to prevent sludge and hair from becoming wrapped around and becoming entangled with the probe resulting in significant improvement in cleaning efficiency and ease of maintenance. In addition, the cleaning timer is built into the converter for realization of reduced total cost.

Features

  • Use of a four-beam transmitted light system for enhanced resistance to soiling
  • Built-in jet cleaning mechanism inside the probe
    The absence of projections such as a cleaning nozzle makes it possible to prevent entanglement of sludge and hair. In addition, the use of a structure in which cleaning water flows from the inside to the outside eliminates accumulation of sludge and hair as a result of being wrapped around the probe.
  • Light source modulation system unaffected by surrounding light
  • Near infrared LED light source featuring a long service life
  • Equipped with concentration conversion function
  • Easy installation with a drop-in probe
  • Built-in cleaner control function

Manufactured by HORIBA Advanced Techno

Specifications

Model

CSS-250

Display

Liquid crystal display

Measuring range

0 - 20000 mg/L (0 - 20.00 g/L)

Measurement ranges

0 - 1000, 2000, 5000, 10000 (9999) mg/L
0 - 1.00, 2.00, 5.00, 10.00, 20.00 g/L
0 - 1.00, 2.00 %
Manual range switching (selectable with DIP switch)

Concentration units

mg/L or g/L, % (selection of 1 unit with DIP switch)

Contact Outputs

Number of contacts: 3-point cleaning contact output (CLN)
Contact type: Semiconductor (SSR) relay, 1a
Contact capacity: AC 200 V, 1 A (current load)
Contact function: Cleaning solenoid valve driving alarm contact output (RLY1)
Contact type: Relay contact, 1a (no-voltage contact)
Contact capacity: AC 250 V, 2 A (resistance load)
Contact function: Upper limit alarm, lower limit alarm
One of the above functions can be selected (selectable with DIP switch)

Alarm contact output (RLY2)

Contact type: Relay contact, 1c (no-voltage contact)
Contact capacity: AC 250 V, 3 A (resistance load)
Contact function: Upper limit alarm, lower limit alarm, CLN synchronization
(cleaning contact output and synchronization error alarm output, one of the above functions can be selected (selectable with DIP switch))

Contact input

No. of contacts: 1
Contact type: Relay contact, 1a (no-voltage contact)
Contact function: Cleaning operation external input
(1) Logical sum with built-in cleaning timer (operates with external input)
(2) Logical product with built-in cleaning timer (operates only within external input range)
(3) Synchronization of built-in cleaning timer with external input
(4) Disabling of built-in cleaning timer
(5) Disabling of external input
One of the above functions can be selected.

Transmission output

DC 4 - 20 mA, isolated input / output type, max. load resistance: 600 Ω, linearity: ±0.5% FS

Control operation

On / off operation, upper limit (H) or lower limit (L) (selectable with DIP switch)
Upper / lower limit setting ranges: Ranges of measurement ranges

Control width

20% (±10%) of measurement range

Calibration functions

Zero adjustment: Span adjustment using tap water: Concentration conversion method by coefficient input

Additional functions

1) Various error messages Calibration error

  • Outside measuring range error:
  • Over full scale, under full scale

Alarm on delay: Delay time setting: 0 - 15 minutes
Cleaning timer setting: Cleaning cycle setting: 1 - 48 hours
Cleaning time setting: 0.1 - 20.0 minutes
Post-cleaning standby time setting: 0.1 - 10.0 minutes
Transmission output designation setting for holding during calibration and cleaning: Continuous, hold (holding of previous value, holding of arbitrary value) (selectable with function setting switch)
Damping factor (response time according to moving average of number of cycles)
Setting function
Setting time: 1 - 50 cycles (equivalent to 0 - 20 seconds)
Designation of periodic nozzle cleaning operation: Short-term cleaning for prevention of adherence of debris performed at fixed time intervals (for 5 seconds at 1 hour intervals: holding operation during regular operation disabled) (selectable with function setting switch)
Upper and lower limit alarm setting
Setting range: 0-FS
Upper and lower limit control width setting
Setting range: Arbitrary setting of 10 % transmission output holding of 0-FS
Setting range: 0-FS

Ambient temperature and humidity

-5 to 50 °C, 85 % RH or less

Power supply

100 - 115 V AC, 50/60 Hz, 7 VA or 200 - 240 V AC, 50/60 Hz, 7 A
(as per user instructions)

Structure

Outdoor installation type: JIS C0920 protective grade: 3 (rain-proof type)
Installation method: 50 A pole or wall mounting
Case: Cast aluminum alloy (paint color: DIC G-262 or equivalent)
Full cover: Polycarbonate (resin color: DIC G-262 or equivalent)
Hood: SUS304 (paint color: DIC G-262 or equivalent and DIC PART2 2600 or equivalent)
Mounting brackets: SUS304

External dimensions

222 (W) x 180 (H) x 155 (D) (excluding mounting brackets and projections)

Weight

Approx. 4 kg

Options

Water pump unit (WPU-10), air pump unit (APU-10), solenoid valve unit (SVU, etc.)