19
Note:
The ideal set point range for
pH
is 0.00 to 16.00 pH.
D. pH RELAYS
There are three independent Alarm channels for pH display. (see
figure 1.
). The hysteresis value will be used by three pH relays.
The action of the pH relays is dependent on set point, relay
action type (HIGH or LOW), hysteresis value and the current
pH display. (see
figure 1.
).
E. TEMPERATURE RELAY
One relay channel is available for temperature display which has
independent set point, action (see
fig. 1
) setting ( HIGH or LOW )
and hysteresis value.
The action of the Temperature relay is dependent on set point,
relay action (HIGH or LOW), hysteresis value and the current
Temperature display. (See fig. 1).
VI. 4 - 20 mA OUTPUT
A. ISOLATION VOLTAGE
The maximum isolation voltage of the 4-20 mA output is 500 VDC.
The voltage differential between the 4-20 mA output and the load
should not exceed 500 VDC.
B. OUTPUT LOAD
The maximum load is 500
Ω
. Output current inaccuracies may occur
for load impedance in excess 500
Ω
.
C. pH & TEMP. LINEAR CURRENT OUTPUT
