Xylem 3675 pH CONTROLLER User Manual
Page 7
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VII) Output Load
a) Relay Output:
The current through the relay output contacts should not exceed 5 Amp at 115V
AC and 2.5 Amp at 230V AC in order not to cause permanent damage to the relay
contacts. This rating is specified for RESISTIVE loads only.
b) Current Output
The maximum load is 550 Ω. Output current inaccuracies may occur for load
impedance in excess of 550 Ω.
VIII) Controller Output Features
The output of the meter consists of two alarm relays and an isolated 4-20 mA
output. The operation of the meter is described below.
a) CONTROLLER INPUT RANGE
1. Relay Outputs:
pH
0 to 14.00 pH
mV ±1999 mV
2. Current Output:
pH
0 to 14.00 pH
mV 0 to 1400 mV
IX) Alarm Relay And Led Formats
a) HIGH ALARM set point:
1. Press the HIGH ALARM set point switch. The instrument will indicate the
alarm set point value. The alarm set point value can be adjusted by the
HIGH ALARM set point control.
2. Release the HIGH ALARM set point switch. The instrument will indicate
the measured processes value.
3. The High ALARM set point LED will be ON and the HIGH ALARM
output relay will be energized when the measured value is greater then the
alarm set point value. The HIGH ALARM set point LED will be OFF and
the HIGH ALARM output relay will be de-energized when the measured
value is less then the alarm set point value.
b) LOW ALARM set point: