Enviro Alert EA800, Installation & Owner'S Manual

Page: 18 / 98

14 D-011-0152
Sensors
Sensor Parameter Descriptions
This section provides a description of each sensor parameter.
Table 11 Sensor Parameter Descriptions
Parameter Applicable to Sensors Description
Sensor Name All A name used to identify the sensor in the alarm system. Select a name
readily identified by the viewer. The sensor name is displayed on the
Main screen during a no-alarm condition and on the Alarm screen during
an alarm condition. Two name choice types are available:
• Common Name: These are preprogrammed names.
• Custom Name: This selection allows you to enter any name if the
preprogrammed common names do not adequately identify the sensor
in the system (limited to 16 characters).
Note:
Duplicate sensor names are not permitted.
Unit of
Measure
• Blue, Red and White
temperature sensors
• 4-20mA sensor
• Wireless
temperature sensors
This parameter allows you to choose the unit of measure used for sen-
sor reading and display.
• Blue, Red and White temperature sensors: °C or °F
• 4-20mA sensors: the following Common Units of measure are
available: F (Fahrenheit), C (Centigrade), K (Kelvin), % rh (percent
relative humidity), psi (pounds per square inch), Pa (Pascals), kPa
(kiloPascals), lb (pound), kg (kilogram)
• 4-20mA sensors can also use custom units. Enter the appropriate units
for the connected 4-20mA sensor via the keypad.
Resolution 4-20mA sensor This determines the range that may be used for the 4-20mA sensor. The
full scale range is determined by the values entered in the Low Scaled
Value and the High Scaled Value. You must select the correct resolution
in order to set the true range limits for the 4-20mA sensor you are install-
ing. The available values are as follows:
Maximum Allowed Maximum Allowed
Resolution Low Scaled Value High Scaled Value
1. -9999. +9999.
0.1 -999.9 +999.9
0.01 -99.99 +99.99
0.001 -9.999 +9.999
Low Scaled
Value
4-20mA sensor This parameter equals the environmental reading that results in a sensor
output of 4mA or its minimum valid reading. This is dependent on the
setting of the resolution as discussed above.
High Scaled
Value
4-20mA sensor This parameter equals the environmental reading that results in a sensor
output of 20mA or its maximum valid reading. This is dependent on the
setting of the resolution as discussed above.
Hysteresis • Blue, Red and White
temperature sensors
• HA-III+
• 4-20mA sensor
The Hysteresis setting helps prevent alarms from being set and reset
continually if the environment is at or near the alarm set point by provid-
ing an acceptable variance. For example, if Hysteresis is set at 2 and the
sensor High limit is set at 50, the sensor reading must decrease to 48
(50 minus 2) in order for the alarm condition to reset to a no-alarm condi-
tion.
Low Alarm
Limit
• Blue, Red and White
temperature sensors
• HA-III+
• 4-20mA sensor
• Wireless humidity
sensor
• Wireless
temperature sensor
The Low Alarm Limit sets the value that trips the low alarm when
exceeded.