LDO Continuous oxygen measurement The profile The advantages The technical data The controllers HACH LANGE Services

LDO The optical measurement of oxygen

The LANGE LDO method is based on a completely new, optical principle. The measurement is carried out by way of an oxygen-sensitive coating that is excited by a blue light-emitting diode. After excitation the coating subsequently emits red light. The elapsed time between excitation and emission corresponds to the DO concentration. A further (red)LED is used to compensate for minor variations within the cell.

Sensor materials: Measuring principle: Measuring range: Resolution: Temperature range: Min. flow rate: Calibration: Cable:

Foamed Noryl, 316 SS Luminescence 0.05-20.00 mg/l, 0.05-20.00 ppm, 0.5-200% saturation 0.01 mg/l, 0.01 ppm, 0.01 % saturation 0-+50 °C none not required 10 m integral cable with quick disconnect plug. Max. distance to controller 300 m by using a junction box and additional cables

The new SC 100 controller has two independent probe connectors, with which it can control one or two different digital sensors in parallel. Both measured values are displayed on site and can be transmitted in either analogue or digital form to higher-level control systems. The SC 100 universal controller is preconfigured with conventional control algorithms such as two-position controllers, P, PI and PID controllers and can be easily parameterised on site. It can perform small, clear automation tasks decentrally and cost-efficiently without additional external modules.

SC 100 Controller

Sensor materials: Measuring principle: Measuring range: Resolution: Temperature range: Min. flow rate: Calibration: Cable:

Foamed Noryl, 316 SS Luminescence 0.05-20.00 mg/l, 0.05-20.00 ppm, 0.5-200% saturation 0.01 mg/l, 0.01 ppm, 0.01 % saturation 0-+50 °C none not required 10 m integral cable with quick disconnect plug. Max. distance to controller 300 m by using a junction box and additional cables

The new SC 1000 controller offers maximum flexibility for all digital probes and analysers. It consists of a display module and a probe module. Whether as a conventional controller for up to eight different sensors or as part of an extensive network - the modular upgradable system enables made-to-measure solutions to be found for plants of all types and sizes. They are especially easy to implement and can be upgraded at any time by networking. Digital data transfer between probe and controller and within the network guarantees access to extensive diagnostic functions and a high level of availability. The portable colour graphic display facilitates intuitive operation using the touchscreen. The SC 1000 standard controller comes with conventional algorithms such as two-position controllers, P, PI and PID controllers and can be easily parameterised on site. The linkage of several measurement variables enables new variables such as loads to be derived. Small and clear tasks can be carried out decentrally and cost-efficiently without additional external modules.

SC 1000 Controller

A controller system to which SC sensors can be connected and from which they can be controlled consists of a single SC 1000 display module (model LXV402) and one or more SC 1000 probe modules (model LXV400). The system is configured modularly in line with customer-specific requirements and can be expanded at any time with additional measurement stations, sensors, inputs, outputs and bus interfaces.

Display Operation Protection class Ambient temperature Dimensions Special characteristics Optional

Colour graphics display, QVGA 320 x 240 dot matrix, 256 colours Touchscreen with intuitive operator guidance and time-course graphs IP 65 -20 bis +55 °C (-4 bis 131 °F) (W x H x D) 200 x 230 x 50 mm; weight approx. 1,2 kg Service interface; slot for multimedia card (MMC) Triband data telephone to the GSM standard (GSM900, EGSM900, GSM1800, GSM1900) for remote data transmission and remote operation with built-in antenna. A SIM card (to ISO 7816-3 IC, GSM 11.11) is needed to enable the data telephone to be used.

The probe module is used to connect SC sensors to a measurement station. Several probe modules can be networked to create a SC 1000 network.

Sensor inputs Measuring range Optional plug-in cards for expanding the probe module Optional expansion modules Protection class Ambient temperature Mains power connector Dimensions Weight

For SC sensors with SC digital technology, optional 4, 6 or 8 sensors. All parameters are freely configurable and combinable. Depends on the connected sensor - Analogue outputs: 0/4 - 20 mA output, max. 500 Ohm - Analogue/digital inputs: optionally programmable as 0/4 - 20 mA input or digital input - Relay contacts: potential-free break contacts SPST-NC (normally closed), 250 V AC max. 5 A, 125 V AC max. 5 A, 125 V DC max. 0.15 A, 30 V DC max. 5 A, programmable as limit value, status or timer - Field bus connection: Modbus RS485, Profibus DP, others on request For the switch cabinet; on request IP 65 -20 bis +55 °C (-4 bis 131 °F) 100 - 240 V AC, 50/60 Hz, max. 75 VA, Optional: 24 V DC, 75 watt (W x H x D) 315 x 255 x 150 mm Probe module with mounted display module Approx. 5 kg, depending on the configuration

Digital Bus Communication - An Overview

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