TwO-wIRE TRANSmITTERS FOR pH, ORP, …

1 Product Data SheetLIQ_PDS_5081 2015 TwO-wIRE TRANSmITTERS FOR pH, ORP, conductivity , OxygEN, OzONE, ANDCHLORINE50815081 Family of TwO-wIRE TRANSmITTERS CHOICE OF COMMUNICATION PROTOCOL:HART or FOUNDATIONF ieldbus. LARGE, EASY-TO-READ two-line display shows theprocess measurement and temperature. SIMPLE MENU STRUCTURE. ROBUST TYPE 4X ENCLOSURE. INTRINSICALLY SAFE DESIGN allows the transmitter tobe used in hazardous environments (with appropriate safetybarriers). NON-VOLATILE MEMORY retains program settings andcalibration data during power AND APPLICATIONSThe 5081 family of TRANSmITTERS can be used to meas-ure pH, ORP, conductivity (using either contacting ortoroidal sensors), resistivity, oxygen (ppm and ppblevel), free chlorine, total chlorine, and ozone in a vari-ety of process liquids.

2 The 5081 is compatible withmost Rosemount Analytical sensors. See the Specifi-cation sections for details. The transmitter has a rugged, weatherproof, corro-sion-resistant enclosure The transmitter has a two-line seven-segment main measurement appears in (20 mm)high numerals. The secondary measurement, temper-ature (and pH if free chlorine is being measured),appears in (7 mm) high digits. Two digital communication protocols are available:HART (model option -HT) and Foundation Fieldbus(model options -FF or -FI). Digital communicationsallows access to AMS (Asset Management Solutions).

3 Use AMS to set up and configure the transmitter , readprocess variables, and troubleshoot problems from apersonal computer or host anywhere in the handheld infrared remote controller or the HART andFoundation Fieldbus 375 communicator can also beused for programming and calibrating the remote controller works from as far away as 25081-P pH/ORP transmitter CHANGING FROM pH TO ORP operation takes only seconds. AUTOMATIC TWO-POINT BUFFER CALIBRATION reduces errors. SOLUTION TEMPERATURE COMPENSATION converts measured pHto the pH at 25 C.

4 CONTINUOUS DIAGNOSTICS monitor sensor performance and warnthe user of failure (FAULT) or approaching failure (WARNING).5081-T Toroidal conductivity transmitter MEASURES conductivity , PERCENT CONCENTRATION, ORCUSTOM CURVE VARIABLE. AUTOMATIC TC RECOGNITION simplifies start up. AUTOMATIC/MANUAL TEMPERATURE COMPENSATION ensuresaccurate monitoring and control. BUILT-IN CONCENTRATION CURVES FOR 0-12% NaOH, 0-15% HCl,0-25% and H2SO4. PROGRAMMABLE REFERENCE TEMPERATURE enables temperaturecompensation to temperatures other than 25 degrees Celsius.

5 AUTOMATIC COMPENSATION FOR SENSOR CABLE RESISTANCE improves accuracy of high conductivity Contacting conductivity transmitter MEASURES conductivity , RESISTIVITY, OR CUSTOM CURVEVARIABLE. AUTOMATIC TC RECOGNITION simplifies start up. AUTOMATIC/MANUAL TEMPERATURE COMPENSATION ensuresaccurate monitoring and control. AUTOMATIC COMPENSATION FOR SENSOR CABLE RESISTANCE improves accuracyof high conductivity / low resistivity measurements. BUILT-IN TEMPERATURE COMPENSATION ALGORITHMS include straight slope, ultra-pure water, cation conductivity , and no Amperometric transmitter MEASURES dissolved oxygen (ppm and ppb level), free chlorine,total chlorine, and ozone.

6 SECOND INPUT FOR A pH SENSOR ALLOWS AUTOMATIC pHCORRECTION for free chlorine measurement. No expensive, messyreagents needed. AUTOMATIC BUFFER RECOGNITON FOR pH 3 SPECIFICATIONS - gENERALH ousing:Cast aluminum with epoxy coating. Type 4X (IP65). Neoprene O-ring cover mm x mm x mm ( in. x in. in.)Dimensions:See Openings: -in. NPTA mbient Temperature:-4 to 149 F (-20 to 65 C)Storage Temperature:-22 to 176 F (-30 to 80 C)Relative Humidity:0 to 95% (non-condensing)weight/Shipping weight:10 lb/11 lb ( kg)Display:Two-line LCD; first line shows process vari-able (pH, ORP, conductivity , % concentration,oxygen, ozone, or chlorine), second line showsprocess temperature and output current.

7 ForpH/chlorine combination, the second line canbe toggled to show pH. Fault and warning mes-sages, when triggered, alternate with temperatureand output line: 7 segment LCD, in. (20 mm) line: 7 segment LCD, in. (7mm) board can be rotated 90 degrees clockwise calibration and programming, messages andprompts appear in the second CHazardous Location Approval: For details, seespecifications for the measurement of :EN-61326 Digital Communications: For details, see specifica-tions for the measurement of Power & Load Requirements:Supply voltage at the transmitter terminals should beat least 12 Vdc.

8 Power supply voltage should coverthe voltage drop on the cable plus the external loadresistor required for HART communications (250 Wminimum). Minimum power supply voltage is 12 power supply voltage is Vdc (30 Vdcfor intrinsically safe operation). The graph shows thesupply voltage required to maintain 12 Vdc (upperline) and 30 Vdc (lower line) at the transmitter termi-nals when the current is 22 Output: TwO-wIRE , 4-20 mA output withsuperimposed HART digital signal. Fully scalableover the operating range of the accuracy: mAFOUNDATION fieldbus Power & Load Requirements:A power supply voltageof 9-32 Vdc at 22 mA is Intrinsically Safe COncept/FISCO-compliantversions of 5081 Foundation Fieldbus transmitter optionSpecifications subject to change without 45081-P pH/ORP TRANSmITTERFEATURES The 5081-P transmitter with the appropriate sensor can be configured for either pH or ORP (oxidation reductionpotential) measurement of aqueous solutions.

9 Housed in a Type 4X case, the 5081 can be located close to thesensor even in the harshest environments, including process, water or wastewater monitoring. Advanced featuresinclude automatic 2-point buffer calibration routine, automatic recognition of Pt100 or Pt1000 RTD, and menu-selected internal preamplifier. Predictive sensor diagnostic capability is possible through the impedance measure-ment of the pH glass membrane and reference electrode, fully supported by AMS. Solution temperaturecalibration allows the instrument to calculate and display the pH at 25 C when the temperature coefficient of themeasured liquid is SPECIFICATIONSpH Range: 0 to 14 ORP Range:-1400 to +1400mVCalibrations/standardization.

10 The automatic buffer recog-nition uses stored buffer values and their temperature curvesfor the most common buffer standards available transmitter also performs a stabilization check on thesensor in each manual two-point calibration is made by immersing thesensor in two different buffer solutions and entering the pHvalues. The microprocessor automatically calculates theslope which is used for self-diagnostics. An error messagewill be displayed if the pH sensor is faulty. This slope can beread on the display and/or manually adjusted if on-line one-point process standardization is accom-plished by entering the pH or ORP value of a grab Location:A preamplifier must be used to con-vert the high impedance pH electrode signal to a low imped-ance signal for transmitter use.