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Operator ’ s Manual
OjyjEGA
ENGINEERING, INC.
AnO.VfEG.4 Group Company
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WARRANTY OMEGA warrants this unit to be free of defects in materials and workmanship and to give satisfactory service for a period of 13 months from date of purchase. OMEGA Warranty adds an additional one (1) month grace period to the normal one (1) year product warranty to cover handling and shipping time. This ensures that our customers receive maximum coverage on each product. If the unit should malfunction, it must be returned to the factory for evaluation. Our Customer Service Department wi
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TABLE OF CONTENTS Page No. PART I - INTRODUCTION Specification s 1 General Descriptio n 2 PART II - INSTALLATION 1. Unpacking 2 2. Mounting 2 3. Wiring 3 PART III - OPERATION INSTRUCTION & TECHNICAL INFORMATION 1. Controls 4 2. Operation 4/s PART IV - CALIBRATION 1. Calibration interval 5 2. Equipment required 5 3. Calibration procedure 5/6 PART V SERVICE 1. Block diagram 7 2. Table I 8 3. Transmitter dimensions input/output connections and Adjustment pot location 9 4. Table II 10
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MODEL PHTX-11 SPECIFICATIONS Any 1 thru 14, Spans: jumper programmable zero and span adjustable 1 x 1013 ohm Input Impedance: 4 to 2onlA Output Current: 12 to 80 VDC Power Supply: ii Ez iim+DC>O~~~ONAL 0 to 3400 ohms Load Resistor: *.Ol pH Linearity: f. 02%/OC Temperature Coefficient: (Display and current out) ht.01 pH Accuracy: k.01 pH Repeatability: 3% digit LC D Output meter: .Ol%/Volt Supply Voltage Effect: -10 to +60°C Operating Temperature: 0 to 95% R.H.: 600 VDC or peak Isolation: -120dB
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PART I - INTRODUCTION General description The OMEGAmModel PHTX-11 is a 2-wire pH/ORP transmitter featuring input-out- put isolation, wide power supply range, high input impedance, LCD digital display, modular construction, programmable span selection, manual/automatic temperature compensation and a NEMA 4X housing as a standard enclosure. The Model PHTX-11 accepts as its input any pH probe via a BNC co-axial connector. It transforms the probe signal to a 4 to 20mA D.C. signal that may be transmi
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2.4 Panel Mounting - refer to Table II for hole sizes and locations. This mounting requires the PVC mounting feet and four PVC mounting blocks. The blocks are drilled and tapped for #lo-24 screws. 3 . Wiring 3. 1 After the enclosure is properly mounted the wires for input, output, ground and remote temperature sensing should be routed through the en- closure hubs. These connections should be trimmed to the proper length and connected to the circuit board assembly. The circuit board assembly shou
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PART III - OPERATING INSTRUCTIONS & TECHNICAL INFORMATION 1. Controls 1.1 Display switch is 1abeled"Press for mA" on the cover. The display will indicate 0.00 pH to 14.00 pH when the switch is in the relaxed position. When the switch is pressed and held, the display will indicate the output current to mA, normally 4.0 mA to 20.0 mA. 1.2 "pH CAL" potentiometer is an offset adjustment for the pH probe on the input circuit board. This adjustment allows standardization of different probes, it affect
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2.3 Test the display by pressing the display switch. The display should indicate mA and the decimal point should shift one place to the right. PART IV - CALIBRATION The recommended calibration interval for the transmitter is six months under normal operating conditions, and assuming the sensor is in good condition. This system may need adjustment to compensate for reduced efficiency of the sensor before the calibration interval. Equipment Required 2.1 pH Simulator or a millivolt source. 2.2 Prec
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The output is adjustable RANGE #3 is with jumpers al, #2, and #3 in place. for a span of 1 or 2 pH units. 3.6 SPAN h ZERO adjustments interact and require going back and forth between them. Connect a millivolt source, or preferably a PII simulator at the input, a resistor at the temperature compensation terminals. Adjust (Refer to Table I for the correct resistor and millivolt values). the "Zero" for 4 mA and the "Span" for 20 mA at the desired pH levels. -6-
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TABLE I 2s c ” 50°C 7o c ” 9o c ” 100° C Temp. O'C 4o c ” mv. oH mv. mv. mv. mv. mv. mv. +504 .4 +518.2 0 +379.3 +414-o +434 .9 +448-a +476 .6 +432 .3 +444 .2 I +325 .1 +354 .9 +372 .8 +384 .7 +408 .5 ~360 .3 +370 .2 2 1-270.1 +295 .a +310 .7 +320 .6 +340 .5 3 i272. 4 1-288.2 +296 .1 +216 .8 ‘ 236. 6 +248 .5 +256 .5 +333 1 +204 .3 t-216.2 ___ .L +162 .6 +177 .5 +186 .4 +192 .-l 5 +108 .4 + i18.3 +124 .2 +12a . 2 +136 .2 +144 .1 + i48.1 + 72.0 5 + 74.0 3 6 + 54.19 + 59.15 + 62.13 + 64 .12 + 68.0
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TABLE II PAN EL CUT-OUT ’ 7 .t DIA . HOLE -lO-
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FAX 1M31359-Tmo QWKE%k,. .Your Source for Process Measurement and Control TEMPERA7UWE Cl Thermocouple, RTD & Thermistor Probes &Assemblies Cl Connector Systems and Panels Cl Wire: Thermocouple, RTD and Thermistor Cl Calibrators and Ice Point References Cl Recorders, Controllers and Process Monitors Cl Data Acquisition Modules and Data Loggers - Cl Computer Sensor Interface PRESSURElSTRAlN Cl Transducers Cl Strain Gauges Cl Load Cells Cl Pressure Gauges Cl Instrumentation FLOW C l Rotameters Cl F
