ANALYTICAL MEASUREMENT

	Measuring and control instruments for pH , Conductivity , Dissolved oxygen measurement, Chlorine, Chlorine dioxide, Ozone and hydrogen peroxide measurement and high-purity water Indicator / controller for analytical measurement
	The compact microprocessor indicator/controller, with 96mm x 48mm bezel size and plug-in controller chassis is used for the visualization and control of variables in analytical measurement (pH value, redox potential, conductivity, high-purity water, oxygen etc.). The indicator has two analog and two logic inputs. The first analog input is suitable for the connection of a 0(4)—20 mA signal, which can be provided by any type of transmitter (including 2-wire types). The input signal is conditioned, as determined by the configuration, and displayed. One special feature of the instrument is, that the calibration procedures for pH, redox and conductivity are stored ready for use. The second analog input can be use to connect a Pt100 or Pt1000 resistance thermometer. The instrument has two 4-digit 7-segment displays for the indication of the main variable (red) and the temperature (green). The temperature display is switched off in the default setting. A separate temperature sensor (Pt100 or Pt1000) can be connected to the second analog input. This can be used to display the temperature o fthe medium and, if required, be monitored by a limit comparator (limit switch). The displays also provide comments on the entries during programming. The two relays of the controller can be configured as a limit controller and/or a pulse width or pulse frequency controller with a P, PI, PD or PID structure. A maximum of 2 relay make (n.o.) contacts, one logic output, one analog process value output and one serial interface are available. The unit is available with an additional relay changeover contact, instead of the analog process value output. An RS422 / RS485 interface for integration into a data network can be supplied as an option. This uses the MODbus/Jbus protocol. The unit can also be delivered with a power supply for a 2-wire transmitter, instead of the interface board.
	Two-wire transmitter for pH and redox
	The 2-wire transmitter is intended for linking a pH or redox combination electrode with plug connection to indicators/controllers with an active 4-20 mA input. On the output side the 2-wire transmitters have a connection for supply and standard signal. Zero and slope of pH combination electrodes are adjusted at the indicator /controller. No calibration is required for redox electrodes. The 2-wire transmitter is screwed directly on to the electrode head of the combination electrodes. This circuit arrangement largely prevents interference from dirt, humidity, or electrical fields from live conductors. A conventional coaxial cable is sufficient as connection between the transmitter and the indicator. This permits trouble-free transmission over larger distances between the transmitter and the indicator. An isolated supply is recommended when operating the transmitters with a PLC.
	Measuring and control instruments for conductivity and high-purity waterInductive conductivity transmitter
	A sturdy housing of glass fibre-reinforced polyamide protects the electronics and the electrical connections from corrosive environmental conditions (Protection IP65). A 3-wire transmitter for conductivity and a 2-wire transmitter for temperature (output signals 4—20mA) are provided as standard. Optionally, the conductivity can be output via an integrated 3 1/2 digit LCD digital display. The standard signals can be processed by suitable indicator/ control units or directly on a PLC.
	Transmitter / controller for pH or redox in 96 x 48 mm format
	This instrument, with a 96mm x 48mm bezel size and a plug-in controller module, measures and controls (depending on the configuration) the pH value or redox voltage of aqueous solutions. The transmitter has two analog and two logic inputs. The first analog input is suitable for connecting a pH combination electrode, or a glass and reference electrode (also antimony), or a redox combination electrode, or a metal and reference electrode. The second analog input can be used to connect Pt100 or Pt1000 resistance thermometers. The instrument features two 4-digit 7-segment displays for indicating the pH or redox voltage process value (red) and the temperature (green). During programming, the displays provide comments on the inputs. A great variety of control tasks can be handled by the various output options (relay contacts and/or analog outputs). The two relay “make” contacts that are provided on the instrument as standard can be configured as a limit controller and/or pulse width or pulse frequency controllers, or as a modulating controller. To obtain analog (continuous) controller outputs, the optional analog outputs must be configured accordingly. All controller outputs can be configured for a P, PI, PD or PID control action. In the basic version, the instrument provides two relay “make” contacts and one logic output (0/5V). Two additional outputs can, according to choice, be fitted as relay changeover contacts and/or analog outputs (process value output or analog controller output) or as a serial interface (Profibus-DP or MODbus/Jbus protocol).
	Transmitter / controller for oxygen in 96 x 48 mm format
	O2 01 two-wire transmitter is used for the measurement of dissolved oxygen in aqueous solutions. It provides an electrically isolated 4-20 mA output signal corresponding to the oxygen content. The instrument can be configured through a setup program or from a terminal box / operating unit (available as an option). The temperature of the medium can be acquired through a Pt1000 in the two-wire transmitter and further processed (from the standard version and above, also as 4-20 mA two-wire signal). The measurement is made with an electrochemical, membrane-covered sensor. The microprocessor circuit incorporated in the two-wire transmitter takes account of the temperature, atmospheric pressure and salinity (salt content) factors. The sensor is of modular design and is easy to maintain and replace. Typical areas of application · Municipal and industrial sewage-treatment plants · Drinking water monitoring · Prevention of water pollution · Fish farming (fresh and salt water) · Processing plants

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