21
The action of the pH relays is dependent on set point, relay control type (HIGH or LOW),
hysteresis mode (Center or Edge), hysteresis value and the current pH display (See figure
4.)
[
Note:
The user can set the
RELAY 1
and
RELAY 2
from 0.00 to 19.99 pH,
but be
reminded that the range of pH is –2.00 to 16.00 pH.
]
E. DO Relays
There are two independent relay channels for the DO display that have
independent
set
points and control types (see figure 4). The hysteresis mode (center or edge) and
hysteresis value will be used by
both
DO relays.
The action of the DO relays is dependent on set point, relay control type (HIGH or LOW),
hysteresis mode (Center or Edge), hysteresis value and the current DO display. (See
figure 4).
[
Note:
The user can set the
RELAY 3
and
RELAY 4
from 0.0 to 599.9% or 0.00 to 69.99
ppm,
but be reminded that the range of DO is 0.00 to 500.0% or 0.00 to 60.00 ppm
only.
]
F. Temperature Relay
One relay channel is available for temperature display which has independent set point
and HIGH or LOW action (see figure 4) setting, hysteresis mode (center or edge) and
hysteresis value.
The action of the temperature relay is dependent on set point, relay action type (HIGH or
LOW), hysteresis mode (Center or Edge), hysteresis value and the current Temperature
display.
[
Note
: The user can set the SET POINT from 0.0 to 199.9 °C,
but be reminded that the
range of the temperature is –10.0 to 120 °C.
]
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
.
