Signet 750 DryLoc ph/orp Sensor Electronics *750.090* 750.090 Rev. G /05 English WARNING! SAFETY INSTRUCTIONS. Depressurize and vent system prior to installation or removal.. Confi rm chemical compatibility before use.. Do not exceed maximum temperature/pressure specifi cations.. Wear safety goggles or faceshield during installation/service. 5. Do not alter product construction. 6. When using chemicals or solvents care should be taken and appropriate eye, face, hand, body, and/or respiratory protection should be used.. Description Signet 750 ph/orp Sensor Electronics provide twowire to 0mA loop output for ph and ORP measurements, without the expense of local display and other luxuries available in fullfeatured transmitters. Preamplifi cation is builtin, reducing system costs while ensuring absolute signal integrity up to 0.8m/,000 feet. These sophisticated fi eldmount devices also provide the digital (S L : Signet Sensor Serial Link) output, the latest development in leadingedge technology from Signet. The 750 Sensor Electronics selfconfi gure for ph or ORP operation via automatic recognition of electrode type, and the DryLoc electrode connector quickly forms a robust assembly for submersible and inline installations. NEMA X Junction Boxes are integral parts of the inline version and are available as accessories for the submersible version. The optional EasyCal feature allows simple pushbutton calibration and includes an LED for visual feedback. English. Description. Specifi cations. Inline Installation. 750 Inline Assembly 5. Submersible Installation 6. Digital (S L) wiring 7. 0 ma Loop wiring 8. Calibration 9. Troubleshooting 0. Ordering Information. Specifications General Compatible Electrodes: Signet DryLoc Electrodes Operational Range: 0.00 to.00 ph, ±000 mv ORP 0 C to 85 C (ºF to 85ºF) Response Time (includes electrode response): ph: <6 s for 95% of change ORP: application dependent ph Temp τ: 0 s (75) 96 s (756) 8 s (756WT) Materials: 750, (inline): PBT (thermal plastic polyester) 750, (submersible): CPVC Cable for, submersible versions: 5 m (5 ft.) conductor shielded, AWG. May be extended up to 8 m (600 ft) with current output. May be extended up to 05 m (000 ft) with S L output. Weight: 750, (inline): 0.75 kg (.75 lb.) 750, (submersible): 0.6 kg (. lb.) Environmental Ambient Temp.: 0 C to 85 C Storage Temp.: 0 C to 85 C Relative Humidity: 95% max, noncondensing Immunity: EN5008 Emissions: EN5008 Enclosure Rating: 750, (inline): NEMA X/IP65 (with electrode connected) 750, (submersible): NEMA 6P/IP68 (with electrode and watertight extension pipe connected) Electrical Input Impedance: >0 Ω Input response time: 500 ms Temperature drift: ±0.00 ph per ºC ±0. mv ORP per ºC Input resolution: 0.0 ph, mv ORP, 0.ºC Current output: Description: ph: Fixed to 0 ma, isolated, 0 to ph (custom scaling available) ORP: Fixed to 0 ma, isolated, 000 to 000 mv (custom scaling available, 000 to 000 mv) Power: Regulated VDC ± 0%, 0 ma max. Max Loop Resistance: 50Ω max. @ V 5Ω max. @ 8V 600Ω max. @ V Accuracy: ±µa @ 5ºC Temperature drift: ±µa per ºC Output resolution: ± 5 µa Error indication:.6 ma Digital (S L) output: Description: Serial ASCII, TTL level 9600 bps Power: 5VDC ± 0% regulated, ma max Accuracy: ph: ± 0.0 ph @ 5 C ORP: ± mv @ 5 C Resolution: ph: 0.0 ph ORP: mv Temp. 0. C Error indication: Temp output "999.9" Standards and Approvals CE Manufactured under ISO 900 & ISO 00
. Inline Dimensions The 750 inline sensor (without EasyCal) is designed for applications where electrode calibration is facilitated by remote equipment. The 750 InLine sensor includes EasyCal. A Signet installation fi tting ( / in. to in.) or a Signet pipe adapter is required to secure the electrode in the pipe. The Signet Measurement and Instrumentation catalog offers a complete selection of fi ttings. The 750 and 750 submersible sensor electronics are recommended for inline applications using the 76 series differential electrodes and the 77 series Threaded DryLoc electrodes. 76 and 77 series electrodes thread directly into standard in. or / in. NPT fi ttings. 5 mm (.5 in.) 78 mm (7 in.) 89. mm (.5 in.).7 in./ 9 mm 8 mm (9.75 in.) 5.5 in./ 0 mm 5 mm (.75 in.) Mounting position 75 and 76 series electrodes must be mounted upright. Vertical (0 ) position optimum Do not install within 0º of horizontal (Contact factory for horizontal or inverted installation requirements.) Recommended maximum fl ow rate 0 ft/s. Wettap electrodes and 77 series electrodes have pressurized electrolyte chambers, enabling them to be mounted at any angle. Vertical ± 60 YES YES 0 0 NO NO NO Signet 750 DryLoc ph/orp Sensor Electronics
. 750 Inline ph Sensor Assembly Note: This procedure applies to systems using standard 75757 electrodes. If the 79 ph/orp WetTap is used, refer to the 79 manual for instructions.. Insert electrode into Signet installation fi tting. Seat the electrode tabs into the alignment notches in the fi tting.. Thread the inline retaining cap onto fi tting to secure the electrode into place. Handtighten the cap. DO NOT use any tools to avoid damaging the threads. Retaining cap Note: Keep the electrical interconnection between electrode and sensor electronics dry and clean at all times.. Unlock the ring on base of 750 (The ring is unlocked when the lines on the ring and body of the 750 are not aligned.) Locking Ring Unlocked The molded alignment marks are enhanced for clarity.. Place 750 onto top of electrode and turn until the assembly drops into position. The molded alignment marks are enhanced for clarity. 5. Turn locking ring / turn to secure the 750 assembly. (The ring is locked when the line on the ring and the line on the body of the 750 are aligned.) Locked InLine Sensor and Electrode Removal To remove electronics assembly only: Turn locking ring / turn; lift assembly straight up. To remove electrode from the pipe: Remove electronics assembly, then unthread retaining cap; pull electrode straight up. To remove the complete 750 system: Hold locking ring in place. Unthread retaining cap and pull electrode straight up. Signet 750 DryLoc ph/orp Sensor Electronics CAUTION! Do not remove the electrode from a pressurized pipe. Wear appropriate protective clothing when working with chemicals in pressurized pipe.
5. 750, Submersible Sensor Assembly and Installation. Insert electrode into base of the 750 or 750 and turn until keyed contacts are seated.. Thread retaining cap over electrode and handtighten onto 750.. Attach / in. watertight pipe to the top of the 750. Secure the threaded connection to prevent any leakage. For additional defense against possible accumulation of condensation at the back seal area of the sensor, fi ll the lower inches (7500 mm) of conduit or extension pipe with a fl exible sealant such as silicone. 750: / in. NPT threads 750: ISO 7/R / threads A light coat of nonpetroleum based lubricant on the Oring will ease installation. 08 mm/ 8. in. Fill with 7500 mm ( to in.) of sealant Note: Keep the electrical interconnection between electrode and sensor electronics dry and clean at all times. 55 mm/.6 in. Use standard installation hardware to connect the submersible 750 or directly to external equipment. OR The 805 NPT Mount Junction box (or 805 with EasyCal) connects to / in. pipe or conduit and provides convenient wiring termination. OR The 8050 Universal Mount junction box (or 8050 with Easy Cal) mounts fl at onto a wall or can be strapped to a post or pipe. 9 mm/.7 in. 06 mm/. in. 07 mm/. in. / in. NPT threads 9 mm/.7 in. Fill with to in. of sealant Fill with to in. of sealant Cable supplied: 5 m (5 ft.) conductor shld, AWG. May be extended up to 8 m (600 ft) with current output. May be extended up to 05 m (000 ft) with S L output. Signet 750 DryLoc ph/orp Sensor Electronics
6. Digital (S L) wiring When the 750 is powered with 5 VDC, the digital (S L) serial data output is automatically selected. S L data is used exclusively by Signet instruments. Remove approximately 0 mm (0. in.) of insulation and tin each conductor before inserting into connectors. S L with no junction box S L with Junction box Black Red White Shield 5 VDC SL data Signal Ground SW Run SW Cal D S 5 VDC S L data Signal Ground Optional Earth ground Connect the 750 cable directly to S L I/O terminals. 8900 users: If this direct wiring is used, set the CALIBRATE menu to "perform calibration at INSTRUMENT" When the 750 includes a terminal block, connect the 750 terminals as shown to any S L I/O port. 8900 users: If the 750 includes the EasyCal accessory, set the CALIBRATE menu to "perform Calibration at either SENSOR or INSTRUMENT" If SENSOR, use standard ph buffer values (ph, 7, or 0) to perform periodic calibration. If INSTRUMENT, any ph value can be used. 7. 0 ma Loop wiring When the 750 is powered with to VDC, the 0 ma loop output is automatically selected. Remove approximately 0 mm (0. in.) of insulation and tin each conductor before inserting into connectors. Current Loop with no junction box Current loop with Junction box Black Red (no connection) White Shield Optional Earth Ground Power Supply DC V SW Run SW Cal D S Power Supply DC V 0 0 ma loop monitor Optional Earth Ground 0 0 ma loop monitor Connect the 750 cable directly to a Loop device as shown. This confi guration does not provide any calibration capability within the 750 system. Periodic calibration must be performed at the external equipment. When the 750 includes a terminal block, connect the 750 terminals to the Loop device as shown. If the 750 includes the EasyCal accessory, use standard ph buffer values (ph, 7, or 0) to perform periodic calibration. Signet 750 DryLoc ph/orp Sensor Electronics 5
8. Calibration All 750 ph/orp Sensor Electronics are factorycalibrated for maximum outofthebox accuracy. Periodic calibration is required to compensate for electrode aging. The optional EasyCal feature allows calibration to be performed local to the sensor. SW EasyCal button SW RUN/CALIBRATE switch for S L system D EasyCal Indicator (green LED) SW Run S SW Cal D S SW Run SW Cal BLK RED WHT SHLD D EasyCal Procedure: The fi rst step (Reset) is recommended each time an electrode is replaced, but is NOT necessary upon initial installation or periodic calibration. In fact, for periodic calibration it is best for the electrode/sensor assembly to remain intact to minimize the possibility of moisture or other contamination entering the electrical interconnection area. The electrode/sensor connection must remain dry and clean at all times.. Reset the 750 ph/orp Sensor to factory calibration: With no electrode connected to the Sensor, press and hold SW until the LED (D) comes on steady then goes off again (approx. 0 seconds). When the LED goes off, release SW; reset is complete.. Connect an electrode to the 750 ph/orp Sensor.. If S L output is being used, place SW in the Cal position. If 0 ma output is being used, SW position is of no consequence.. Place the electrode/sensor assembly into a calibration solution as follows: (If the electrode is healthy, then the 750 will automatically recognize the solution. The order in which the solutions are used during the calibration procedure is of no consequence.) For ph calibration, use any two of these international standards: ph.0, 7.0 or 0.0 buffer solutions. (Signet part number 0700.90 contains one capsule of each value) To produce standards for ORP calibration, mix the chemical Quinhydrone into ph 7.0 and.0 buffers to saturation (/8g per 50ml). Regardless of the size of the container used for calibration, one inch of solution is adequate to completely submerge the tip of the electrode. Allow at least 0 seconds for the electrode response to stabilize before calibration. 5. Press and hold SW for approximately 8 to 0 seconds. During this time, the LED (D) will come on steady then go back off. Release SW (If the LED blinks several times rapidly, the calibration was not successful. See the troubleshooting section.) 6. Remove the electrode/sensor assembly from the fi rst calibration solution, rinse the electrode with clean water, and place it in a second solution. Allow at least 0 seconds for the electrode response to stabilize before calibration. 7. Press and hold SW for approximately 8 to 0 seconds. During this time, the LED will come on steady then go back off. Release SW. (If the LED blinks several times rapidly, the calibration was not successful. See the troubleshooting section.) 8. For S L systems ONLY: Return SW to the RUN position. Calibration is complete. Return the system to service. 6 Signet 750 DryLoc ph/orp Sensor Electronics
9. Troubleshooting LED and Output Condition Current Out: LED off, current output is.6 ma S L: Temp out is 999.9 During EasyCal, the LED blinks rapidly for seconds and the current output is frozen at a random fixed value. After completing calibration procedure, the output values are inaccurate. Possible Causes No electrode installed Bad/dirty contacts between electrode and 750 The buffer solution is outside of the accepted tolerance for the 750 The electrode is depleted (>. ph or 65 mv offset) Insuffi cient time allowed for electrode stabilization during calibration. Suggested Solutions Install electrode Check interconnection between electrode and 750, clean contacts ph system: Use fresh ph, 7 ph, or 0 ph buffer and restart the calibration. ORP system: Use fresh ph and 7 ph buffer solution saturated with quinhydrone. Replace the electrode. Recalibrate, verify that test solutions are at room temperature and wait at least 0 seconds after placing electrode in solution before pressing S EasyCal button. Signet 750 DryLoc ph/orp Sensor Electronics 7
0. Ordering Information Mfr. Part No. Code Description 750 59 000 7 Inline Sensor Electronics w/junction Box 750 59 000 75 Inline Sensor Electronics w/junction Box and EasyCal 750 59 000 76 Submersible Sensor Electronics with 5 ft. cable, / in. NPT threads 750 59 000 8 Submersible Sensor Electronics with 5 ft. cable, ISO 7/R / threads Parts and Accessories Mfr. Part No. Code Description DryLoc ph Electrodes 75 59 000 77 Electrode, ph, DryLoc, fl at, PT000 75 59 00 80 Electrode, ph, DryLoc, fl at, KΩ 75HF 59 000 78 Electrode, ph, DryLoc, fl at, PT000, HFresist (<%) 75HF 59 00 8 Electrode, ph, DryLoc, fl at, KΩ, HFresist (<%) 756 59 000 750 Electrode, ph, DryLoc, bulb, PT000 756DI 59 000 75 Electrode, ph, DryLoc, bulb, PT000, DI (<00 µs) 756DI 59 00 8 Electrode, ph, DryLoc, bulb, KΩ, DI (<00 µs) 756WT 59 000 8 Electrode, ph, DryLoc, bulb, PT000, wettap 756WT 59 00 8 Electrode, ph, DryLoc, bulb, KΩ, wettap 756WTP 59 00 90 Electrode, ph, DryLoc, bulb, PT000, wettap 756WTP 59 00 8 Electrode, ph, DryLoc, plastic bulb, KΩ, wettap 76 59 000 9 Electrode, ph, DryLoc, fl at, KΩ, differential, in. NPT process connection 76 59 000 9 Electrode, ph, DryLoc, fl at, PT000, differential, in. NPT process connection 76 59 000 95 Electrode, ph, DryLoc, fl at, 00Ω, differential, in. NPT process connection 766 59 000 99 Electrode, ph, DryLoc, bulb, KΩ, differential, in. NPT process connection 766 59 000 950 Electrode, ph, DryLoc, bulb, PT000, differential, in. NPT process connection 766 59 000 95 Electrode, ph, DryLoc, bulb, 00Ω, differential, in. NPT process connection 77 59 000 955 Electrode, ph, DryLoc, fl at, KΩ, ¾ in. NPT process connection 77 59 000 956 Electrode, ph, DryLoc, fl at, PT000, ¾ in. NPT process connection 776 59 000 959 Electrode, ph, DryLoc, bulb, KΩ, ¾ in. NPT process connection 776 59 000 960 Electrode, ph, DryLoc, fl at, PT000, ¾ in. NPT process connection DryLoc ORP (Redox) Electrodes 755 59 000 79 Electrode, ORP, DryLoc, fl at, 0KΩ ID 757 59 000 75 Electrode, ORP, DryLoc, bulb, 0KΩ ID 757WT 59 000 85 Electrode, ORP, DryLoc, bulb, 0KΩ ID, wettap 765 59 000 96 Electrode, ORP, DryLoc, fl at, 0KΩ ID, differential, in. NPT process connection 765 59 000 97 Electrode, ORP, DryLoc, fl at, PT000, differential, in. NPT process connection 765 59 000 98 Electrode, ORP, DryLoc, fl at, 00Ω, differential, in. NPT process connection 767 59 000 95 Electrode, ORP, DryLoc, bulb, 0KΩ ID, differential, in. NPT process connection 767 59 000 95 Electrode, ORP, DryLoc, bulb, PT000, differential, in. NPT process connection 767 59 000 95 Electrode, ORP, DryLoc, bulb, 00Ω, differential, in. NPT process connection 775 59 000 957 Electrode, ORP, DryLoc, fl at, 0KΩ ID, ¾ in. NPT process connection 775 59 000 958 Electrode, ORP, DryLoc, fl at, no tc, ¾ in. NPT process connection 777 59 000 96 Electrode, ORP, DryLoc, bulb, 0 KΩ ID, ¾ in. NPT process connection 777 59 000 96 Electrode, ORP, DryLoc, bulb, no tc, ¾ in. NPT process connection Miscellaneous Accessories 8050 59 000 75 Universal Mount Junction Box 8050 59 000 75 Universal Mount Jct. Box w/easycal 805 59 000 755 / in. NPT Mount Junction Box 805 59 000 756 / in. NPT Mount Jct. Box w/easycal 759 59 000 76 ph/orp Simulator/System tester 759.9 59 000 76 Adapter cable to connect 759 and 750 0700.90 98 86 0 ph Buffer Kit P550P00 59 000 60 Universal Pipe Adapter PVC P550C00 59 000 6 Universal Pipe Adapter CPVC P550V00 59 000 59 Universal Pipe Adapter PVDF 550 59 000 76 Cable, conductor shield (blk/red/wht/shld) AWG (per ft) George Fischer Signet Inc. 0 Aerojet Avenue, El Monte, CA 9788 U.S.A. Tel. (66) 57770 Fax (66) 57057 For Worldwide Sales and Service, visit our website: www.gfsignet.com Or call (in the U.S.): (800) 85090 750.090 Rev. G /05 English George Fischer Signet Inc. 00 Printed in U.S.A. on Recycled Paper