CAUTIONCurrent to the relay terminal connections should never exceed 10 amps for 115V or 5amps for 220V. This includes inductive or capacitive surges associated with motorsand other devices. Adequate current protection MUST be insured by means of a fusein any external circuit. The use of "slo-blo" or delayed action fuses is notrecommended. Higher currents can be handled by a separate external power relay ifrequired.SENSOR INSTALLATIONSensors must be installed in a vertical position to insure proper operation.SUBMERSIBLE TYPE SENSOR INSTALLATIONThe 921243 sensor is equipped with a 3/4" NPT male fitting (See Fig. 4) so it can be attached to a pipecoupling or pipe and may be installed directly into the sample. The sensor may also be mounted on Delta'sexclusive "Sweep-Ell" handrail mounting system (See Fig. 7). The "Sweep-E11" system is provided withinstructions and all required hardware.FLOW-THRU CELL INSTALLATIONThe 921243 sensor is equipped with 1 1/2" NPT thread for installation into a suitable pipe "Tee" or Delta'sModel 915240 Flow-Thru Tee assembly (See Fig. 5). The 915240 assembly has two 3/4" NPT female fittingsfor connection to the sample pipe. The "Tee" should mounted in a horizontal position with the sensor installedvertically in the Tee with the membrane facing down. A Minimum flow rate of 3 GPM is required.PRE-CALIBRATIONCHECKSThe paragraphs that follow describe the calibration procedures for FAC TFC/Auto TFC/Manual. For locationand identification of indicators and controls refer to Fig.2 and Table 1.Calibration of analyzer for FAC, TFC, preliminary steps prior to use:1.After performing installation procedure (pg. 9 of this manual), turn the instrument on. At this time thedisplay operation is verified. (During the memory check the display contains four dashes.) Thefollowing sequence is displayed for visual verification at approximately half-second intervals:10
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