Xylem 6308DT INDUSTRIAL DISSOLVED OXYGEN TRANSMITTERS - Manual (Page 15)

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(c) HYSTERESIS (mode) - this is the hysteresis mode for
TEMPERATURE alarm. You can choose "CENTER" or "EDGE."
(See chapter VI. CONTROLLING THE RELAYS.)
(d) HYSTERESIS (value) - this is the actual value of the hysteresis. You
can change this value from 0.0 to 19. 9°C. (See chapter VI.
CONTROLLING THE RELAYS.)
(e) RS 485 ID - this is the unique ID/Address for the unit. If you are
connecting multiple model 6308DT or other Global Water models
for logging purposes then this ID/Address must be unique for
each connected unit. This ID/Address is the same address that must
be used by the PC program to communicate with this unit.
(f) LOCK NO - this is your security code if the unit is locked the
value here will not be available. You need to input the correct code
in the PASSWORD CHECK page.
CAUTION: THE USER IS RESPONSIBLE IN
REMEMBERING THEIR PASSWORD NUMBER,
OTHERWISE YOU WOULD NO BE ABLE TO CALIBRATE
OR CHANGE THE SETTINGS.
V) Controlling the Relays
a) Isolation Voltage
The maximum isolation voltage of the relay output contacts is 1500 VDC. The
voltage differential between the relay output contacts and the load should not
exceed 1500 VDC.
b) Output Load
The current through the relay output contacts should not exceed 5 Amp at 115
VAC and 2.5 Amp at 230 VAC in order not to cause permanent damage to the
relay contacts. This rating is specified for resistive loads only.
c) Relay action, relay set point, hysteresis mode & hysteresis value
Relay
Action Hysteresis mode Effective RELAY-
ON Set point Effective RELAY-
OFF Set point
HIGH CENTER S.P.+ ½(H.V.) S.P. -½ (H.V.)
HIGH EDGE S.P. S.P. - (H.V)
LOW CENTER S.P.-½ (H.V.) S.P.+½ (H.V.)
LOW EDGE S.P S.P.+(H.V.)
S.P. = Relay Set point
H.V. = Hysteresis value (Dead Band)