Enviro EA800 - Manual (Page 15)

General Information
D-011-0152 11
Humidity Sensors
Table 6 lists the humidity sensors available for use with the EA800 Alarm System.
4-20mA Sensors
Theory of Operation
Industry standard 4-20mA sensors can be used with the EA800. However, it is important to verify that this type of
sensor will operate properly over the entire output range.
Figure 6 shows an example of the loop circuit for a 4-20mA sensor whose minimum operating voltage is 8V or less
when connected to an EA800 base unit that is powered with 12VDC.
Figure 6 I4-20mA Sensor Wiring Diagram - EA800 Aux Power Supply
Figure 7 shows an example of the loop circuit for a 4-20mA sensor whose minimum operating voltage is greater
than 8V when connected to an EA800 base unit that is powered with 12VDC.
Figure 7 4-20mA Sensor Wiring Diagram - External Power Supply
Table 6 EA800 Compatible Humidity Sensors
Sensor Part Number Description Operating Range/Parameters
HA-III+ PN M-001-0091 Humidity monitoring module 5% to 95% rh
(non-condensing)
Wireless
Humidity
PN M-001-0126 Wireless humidity monitoring
module
5% to 95% rh
(non-condensing)
+
DC
+
-
4.0V 200O
Aux Power
J5
+
(-)
+
(-)
Input N
J6
+
-
Vsensor
4-20mA
Transmitter
EA800
Max Load of
200O includes
1000' of 22 AWG
(2 conductor)
wire connecting
the EA800 to the
4-20mA sensor
If Vsensor = 8V and Aux Power = 12V
+ DC
External
Supply
+
-
4.0V 200O
Aux Power
J5
+
(-)
+
(-)
Input N
J6
+
-
Vsensor
4-20mA
Transmitter
EA800
Max Load of
200O includes
1000' of 22 AWG
(2 conductor)
wire connecting
the EA800 to the
4-20mA sensor
If Vsensor > 8V and Aux Power = 12V