User manual EUTECH INSTRUMENTS ALPHA PH DIFFERENTIAL PROBE

[. . . ] INSTRUCTION MANUAL ECFP21A1A1 Differential pH Sensor 1 ½ Inch NPT Mounting Threads Technology Made Easy . . . 68X216866 Rev 0 10/04 Preface This instruction manual serves to explain the use of the ECFP21A1A1 1½ inch pH sensor and is written to cover as many applications as possible. Please do not hesitate to contact Eutech Instruments or an authorized representative with questions or concerns. The information presented in this instruction manual is subject to change without notice as improvements are made, and does not represent any commitment whatsoever on the part of Eutech Instruments. Eutech Instruments cannot accept any responsibility for damage or malfunction of the sensor due to improper use. [. . . ] Connect both the sensor cable wires and the interconnect wires to the terminal strip. Use a watertight cord grip to insert the sensor cable into the Alpha pH2000D Controller. Conduit holes are found on the bottom of the Alpha pH2000D controller for this purpose. Connect the sensor wires to the Alpha pH2000D controller as outlined in the controller manual. Be sure that the wire colors of the sensor cable match those of the interconnect cable on either side of the terminal strip. Route the interconnect cable through metal conduit to minimize electrical noise that may interfere with the sensor signal. 5 Instruction manuals ECFP21A1A1 3. 2. Mounting Hardware Eutech Instruments' short nose sensor (Fig 3. 2) has insertion threads located closer to the sensing elements and is recommended for short branch tees (typically metal tees and SCH 40 plastic tees). Save the protective cap and use it to keep electrodes moist whenever the sensor is removed from service. When taking a sensor out of storage, soak the sensor in a pH 7 buffer solution for 30 minutes before calibration. If the sensor does not calibrate, refer to Section 4 to review maintenance, refurbishment and troubleshooting options. This will insure that entrained air does not form a pocket around the sensor head. Remove the protective cap from the sensor head and make sure moisture is present and that the salt bridge has not dried out. If the protective cap is dry, the sensor should be hydrated in tap water for at least 1 hour prior to calibration. It is recommended to use a 2-point buffer calibration on installation of the sensor. If measurement response time is slow or if the sensor will not calibrate, refer to Section 4 for maintenance, refurbishment and troubleshooting suggestions. 2. Mount: a. Insert the sensor into the tee and slowly turn clockwise until secure. Be sure the pipe remains full when the sensors are installed. 9 Instruction manuals ECFP21A1A1 3. 2. 2. Immersion Mounting For immersion mounting applications the sensor is connected to a 1½ inch extension pipe to protect the cable from damage and to reduce the possibility of leaks that may damage the sensor. Figure 3. 5: Immersion mounting assembly 10 Instruction manuals ECFP21A1A1 Detailed Insertion Mount Installation Instructions 1. Attach the sensor to the 1. 5 inch NPT coupling by turning the sensor in a clockwise direction until secure. Either route the cable directly to the Alpha pH2000D or splice the wires in a junction box and use an extension cable. Insert the cable into the Alpha pH2000D controller through a watertight cord grip. Conduit holes are provided for the cord grip on the bottom of the Alpha pH2000D controller. Connect the sensor wires into the Alpha pH2000D sensor terminal block as shown in the Alpha pH2000D manual. [. . . ] Connect the (+) lead of a millivolt meter to the RED wire and the (-) lead of the millivolt meter to the GREEN wire. Stir the sensor for 10 to 15 seconds and then allow the sensor to stabilize in solution for about 2 minutes. If the reading is higher or lower than specified, replace the salt bridge and filling solution and try again. If on the second attempt the offset does not meet specification, replace the sensor. [. . . ]