Current to the relay terminal connections should never exceed 10 amps for 115V or 5
amps for 220V. This includes inductive or capacitive surges associated with motors
and other devices. Adequate current protection MUST be insured by means of a fuse
in any external circuit. The use of "slo-blo" or delayed action fuses is not
recommended. Higher currents can be handled by a separate external power relay if
Sensors must be installed in a vertical position to insure proper operation.
SUBMERSIBLE TYPE SENSOR INSTALLATION
The 921243 sensor is equipped with a 3/4" NPT male fitting (See Fig. 4) so it can be attached to a pipe
coupling or pipe and may be installed directly into the sample. The sensor may also be mounted on Delta's
exclusive "Sweep-Ell" handrail mounting system (See Fig. 7). The "Sweep-E11" system is provided with
instructions and all required hardware.
FLOW-THRU CELL INSTALLATION
The 921243 sensor is equipped with 1 1/2" NPT thread for installation into a suitable pipe "Tee" or Delta's
Model 915240 Flow-Thru Tee assembly (See Fig. 5). The 915240 assembly has two 3/4" NPT female fittings
for connection to the sample pipe. The "Tee" should mounted in a horizontal position with the sensor installed
vertically in the Tee with the membrane facing down. A Minimum flow rate of 3 GPM is required.
The paragraphs that follow describe the calibration procedures for FAC TFC/Auto TFC/Manual. For location
and identification of indicators and controls refer to Fig.2 and Table 1.
Calibration of analyzer for FAC, TFC, preliminary steps prior to use:
After performing installation procedure (pg. 9 of this manual), turn the instrument on. At this time the
display operation is verified. (During the memory check the display contains four dashes.) The
following sequence is displayed for visual verification at approximately half-second intervals: