dTRANS Rd 01 µP Transmitter / Controller for redox potential (ORP)

JUMO GmbH & Co. KG • 36035 Fulda, GermanyData Sheet 20.2535 Page 2/9OperationFor easy programming and operation, thecontroller parameter and configurationdata are assigned to various levels.Indications / controls(1)(7)mVK1 K2 K3 K4(2)(3)(6)°CPGMEXIT(4)(5)Code words protect the levels fromunauthorized access.Membrane keys ensure simple and userfriendlyoperation.The two LED displays show the parametersymbols and the corresponding values.Operating levelThe lower display, for example, shows thesymbol, the upper display shows thecorresponding value. Setpoints SPr1 andSPr2 can be altered by using themembrane keys.Parameter levelThe controller is adapted to the controlloop at this level. The appropriateparameters appear here, with symbol andvalue.Only those parameters will be indicatedwhich correspond to the configuration ofthe controller (configuration level).Configuration levelThis level is used to adapt the controller tothe control task, or for adaptation of theinputs and outputs.(1) Status indicators (yellow)for outputs 1 to 4(2) Increment key for altering parametersor manual operation of relay K2(3) Decrement key for altering parametersor manual operation of relay K1(4) EXIT key to leavethe levels(5) PGM key for selection of parametersand confirmation of entriesCalibration optionsThe electrode zero point of a redoxcombination electrode is subject tomanufacturing tolerances and variationsdepending on usage.The transmitter offers the feature of usinga step-by-step calibration procedure – the1-point calibration – to make a freshdetermination of the zero point of theelectrode by using a buffer solution or asolution with a known redox potential.The transmitter also offers the facility ofmanually entering or adjusting the zeropoint (as determined by a laboratory, forexample).Additional functions of the JUMOdTRANS Rd 01❏ Programmable response of theprocess value output tounderrange/overrangeOn underrange or overrange, theprocess value output can move to thefollowing operational states:-4%, 0%, 100% or 110% freelyselectableExample: Instrument is programmed to4 — 20 mA corresponding to100 — 500 mVThe instrument can be set up so that, onfalling below 100, the output signal iseither held at 4 mA (0%) or drops to3.84 mA (-4%). The 3.84 mA value can(6) 4-digit temperature display(LED, green, 8mm high)(7) 4-digit process value indication(LED, red, 13mm high)(3)+(5)(2)+(4)“CAL”: Initiating electrode calibration(single-point calibration)Initiate manual operation or holdthen be recognized as “irregular” by aconnected PLC.❏ The response of the controller relaysto “Hold” can be defined“Hold” is initiated either manually, usingthe keys, by a logic input, or by an alarmevent. The outputs of the relays K1 andK2 can move to the following(programmable) states on “Hold”:0% Relay de-energized50% output For dynamic controllers,50% of the maximumpulse width or frequencyis produced100% output Relay is energized, ormaximum pulse width /frequencyOutputacceptedThe present outputcontinues to beproduced❏ In “Manual” mode, the relays K1 andK2 are operated manually, by usingthe keys. Either key or switch operationcan be selected, by a setting at theparameter level.Key operation: The relay is switched aslong as the key is pressed (e.g. formanual dosing).Switch operation: The first key strokeswitches the relay on – the secondswitches it off again (toggle action), e.g.for emptying large tanks.08.04 / 00363906