Enviro EA800 Sensor Parameter Descriptions, Resolution, Maximum Allowed, High Scaled Value

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		• Blue, Red and White	This parameter allows you to choose the unit of measure used for sen-
Measure		temperature sensors	sor reading and display.
		• 4-20mA sensor	• Blue, Red and White temperature sensors: °C or °F
		• Wireless	• 4-20mA sensors: the following Common Units of measure are
		temperature sensors	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:
			Resolution	Maximum Allowed	Maximum Allowed
				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		4-20mA sensor	This parameter equals the environmental reading that results in a sensor
Value			output of 4mA or its minimum valid reading. This is dependent on the
			setting of the resolution as discussed above.
High Scaled		4-20mA sensor	This parameter equals the environmental reading that results in a sensor
Value			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	The Hysteresis setting helps prevent alarms from being set and reset
		temperature sensors	continually if the environment is at or near the alarm set point by provid-
		• HA-III+	ing an acceptable variance. For example, if Hysteresis is set at 2 and the
		• 4-20mA sensor	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		• Blue, Red and White	The Low Alarm Limit sets the value that trips the low alarm when
Limit		temperature sensors	exceeded.
		• HA-III+
		• 4-20mA sensor
		• Wireless humidity
		sensor
		• Wireless
		temperature sensor

14 D-011-0152