On-Site Dissolved Oxygen Meter CD-250SC

On-Site Dissolved Oxygen Meter CD-250SC

Overview

This on-site dissolved oxygen meter realizes even more enhanced self-diagnostic functions, including detection of damaged sensor diaphragm and penetration of water into the probe, while maintaining practical functions. Sensor checks can be performed on a real-time basis during measurement for the realization of highly reliable measurement of dissolved oxygen. In addition, members of the 250 series contain a built-in cleaning timer in the converter, making it possible to eliminate the need to provide a separate timer unit in the case of using in combination with a cleaning system for realization of reduced total cost.

Features

  • Self-diagnostic functions for reliable measurement
  • One-touch calibration
  • Automatic evaluation of sensor performance
  • Salt concentration calibration function
  • Automatic temperature compensation function
  • Saturation measurement
  • Enables combination with cleaning systems
  • Large, customized LCD
  • Simultaneous display of measured values and parameter settings
  • Built-in cleaning system control function

Manufactured by HORIBA Advanced Techno

Specifications

Model

CD-250SC

Measuring method

Galvanic battery method

Measuring range

Dissolved oxygen: 0.00 - 20.00 mg / L
Saturation: 0 - 200 % (display only)
Temperature: 0.0 - 40.0 °C (display only)

Reproducibility

Within ± 2 % / FS (under same temperature conditions)

Stability

Within ± 2 % / FS / week (under same temperature conditions)

Transmission output range

0.00 - 5.00, 0.00 - 10.00, 0.00 - 15.00, 0.00 - 20.00 (mg / L) (selectable with function setting switch)

Contact output

No. of contacts: 3

Cleaning contact output (CLN)

Contact type: Semiconductor (SSR) relay, 1a
Contact capacity: AC 200 V, 1 A (alternating current load)
Contact functions: Solenoid valve driving for cleaning

Alarm contact output (RLY1)

Contact type: Relay contact, 1a (no-voltage contact)
Contact capacity: AC 250 V, 2 A (resistance load)
Contact functions: Upper limit alarm, lower limit alarm (selectable with function setting switch)

Alarm contact output (RLY2)

Contact type: Relay contact, 1c (no-voltage contact)
Contact capacity: AC 250 V, 3 A (resistance load)
Contact functions: Upper limit alarm, lower limit alarm, CLN synchronization (synchronization with cleaning contact output), error alarm output (selectable with function setting switch)

Contact input

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 function setting switch)
Upper / lower limit setting ranges: 0.00 - 20.00 mg / L

Control width

0.01 - 1.00 mg / L (± 0.50 mg / L)

Automatic diagnostic function

Alarm output type
1c contact output: Uses contact b capacity: AC 250 V, 3 A max. (resistance load),

Output of invalidation of measured values

Diagnosis contents

System error (meter error, sensor error, power supply interruption)
Measured value error (outside measuring range)

Calibration functions

Atmospheric calibration, saturated solution calibration, temperature calibration

Additional functions

1) Various error messages

  • Calibration error (zero point, gain error, temperature)
  • Outside measuring range error (over full scale, under full scale)
  • Temperature sensor error (disconnection, short-circuit)
  • Dissolved oxygen sensor error (damaged diaphragm, outflow of internal liquid, defective cable insulation)
  • Disconnected dissolved oxygen sensor (sensor disconnection, damaged seal ring

2) Alarm on delay: Delay time setting: 0 - 15 minutes
3) Cleaning timer setting: Cleaning cycle setting: 1 - 48 hours
4) Cleaning time setting: 0.1 - 20.0 minutes
5) Post-cleaning standby time setting: 0.1 - 10.0 minutes
6) 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)
7) Damping factor (response time according to moving average of number of cycles) setting function: 1 - 50 cycles (equivalent to 0 - 20 seconds)
8) 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)
9) Measured value shift function: Setting range: ± 2.00 mg / L
10) Transmission output arbitrary holding setting: Setting range: 0.00 - 20.00 mg / L

Temperature compensation range

0.0 - 40.0 °C

Salinity calibration range

0.0 - 5.0 %

Ambient temperature and humidity

-5 to 50 °C, 85 % RH or less

Power supply

AC 100 - 115 V, 50 / 60 Hz, 7 VA or AC 200 - 240 V, 50 / 60 Hz, 7 VA (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