Xylem 3101 CONDUCTIVITY CONTROLLER - Manual (Page 8)

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VIII) Controller Set
a) Press the HI(LO) set switch on the front panel. Refer to Drawing 5 (Page 7.) The
instrument will indicate the conductivity value of the set point.
b) Adjust the HI(LO) set control on the front panel for the desired set point
conductivity value.
c) Release the HI(LO) set switch, the meter will again indicates the measured
conductivity value.
IX) Controller relay output format
a) The HI set control and LO set control each activates an independent ON/OFF
relay.
The load to the relays should be always connected to the ON and COM terminals.
The relay load should not exceed the rating of 8 A at 115 V and 4A at 230V .The
relay rating is for resistive load only.
b) The LED in the set point switch will be ON when the relay is energized. Refer to
Drawing 5 (Page 7.) Power is delivered to the load through the ON and COM
terminals of the relay.
1. High set point
The LED will be ON and the relay will be energized when the
conductivity value is above the HI SET point value.
2. Low set point
The LED will be ON and the relay will be energized when the
conductivity value is less than the LO SET point value.
X) Relay Dead Band (Hysteresis)
a) The DEAD BAND of the ON/OFF relays are factory set to ±5 LSD, least
significant, digit, of the displayed value. DEAD BAND is defined as the process
value band where the relay is actuate upon rising process value and de-actuated
upon failing process value. Refer to Drawing 6 (page 9.) The DEAD BAND is
used to suppress relay chattering when excessive noise is picked up from the
measurement system.