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DUAL TEMP/
HUMIDITY
SENSORS
EME1TH00C
USER MANUAL
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1.1 INTRODUCTION
The EME1TH00C NIST2 sensors feature two NIST traceable, calibrated temperature sensors and an internal calibration
integrity check.
With this technology, the sensors operate in pairs, with the values compared once a second. If a difference greater than
the stated tolerance of the sensor is detected, an alarm is raised to warn that the sensor is out of calibration.
Figure 1-1 shows a NIST Sensor on AlertWerks Plus.
FIGURE -: NIST SENSOR ON ALERTWERKS PLUS
Sensor features:
MULTIPLE TRACEABLE, CALIBRATED TEMPERATURE SENSORS
VALUE AVERAGING BETWEEN TEMPERATURE SENSORS FOR BETTER ACCURACY
INTERNAL CALIBRATION INTEGRITY CHECKING
CHAPTER 1: INTRODUCTION
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1.2 NIST SENSOR COMPATIBILITY
The EME1TH00C NIST2 sensor is compatible with the AlertWerks Plus Gateways with F7 and H7 processors. The NIST2
sensors will not work on the older AlertWerks Plus Gateways with F4 processors.
The NIST2 sensors are compatible with the AlertWerks V4E and V4EL Gateways, but they are not supported on the 8-port
sensor expansion modules. The firmware on the SEC units needs to be upgraded to the latest version that is available.
NOTE: When used with the V4E and V4EL Gateways, the EME1TH00C NIST2 does not show the additional “Calibration
Status” and “Operable Sensors Count” data. Only one temperature data point will be functional.
1.3 EXTENDING THE EME1TH00C SENSORS
The sensor can be extended up to 50 m (165 ft.) using CAT5 cable.
We recommend using shielded type cable as the sensor is susceptible to Electromagnetic interference (EMI). We also
recommend not running the extension cable near any type of power supply or other equipment that will emit EMI.
1.4 EXTENDING THROUGH PATCH PANELS AND RJ-45 COUPLERS
We do not recommend connecting the any of the AlertWerks sensors though patch panels or using the RJ-45 couplers to
extend them.
Although this may work, the connection may be inconsistent. This is due to the low signal strength from the sensor to
the base unit. The resistance of the extra connectors in a patch panel or couplers is often enough to prevent the sensor
from functioning properly.
CHAPTER 1: INTRODUCTION
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TABLE 2-1. SPECIFICATIONS
SPECIFICATION DESCRIPTION
Temperature
Celsius Measurement range -55 to +75° C
Celsius Measurement resolution 1° C
Celsius Measurement accuracy ±0.2°C accuracy from -10 to +75° C
Fahrenheit Measurement range -67 to +167°F
Fahrenheit Measurement resolution 1° F increments
Fahrenheit Measurement accuracy ±0.4° F accuracy from 14 to 167°F
Humidity
Measurement range 0 to 100% Relative humidity
Sensor element wettable? Wettable without damage
Resolution .%
Accuracy at 25°C ±%
Working Range -20 to +60°C
Physical
Extension Cable CATx cable
Power source Powered by the Gateway (no additional power needed)
CHAPTER 2: SPECIFICATIONS
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3.1 OPERATION
After plugging the EME1TH00C NIST2 sensor into a sensor port on the Gateway, the following sensors will be shown on
the unit:
3.1.1 TEMPERATURE SENSOR
The Temperature sensor uses value averaging from the NIST calibrated temperature sensors for the displayed value.
If any temperature sensor value pair has a value difference of more than 1° C, it will be excluded from the averaging
calculation.
3.1.2 HUMIDITY SENSOR (TH NIST SENSORS ONLY)
The Humidity sensor displays the humidity reading from the NIST calibrated sensor.
3.1.3 OPERABLE SENSORS COUNT
This sensor status shows the number of sensors that are working (sensors which have successful communications with
the base unit).
3.1.4 CALIBRATION STATUS
This sensor status shows the calibration status of the temperature sensors.
When all sensor readings are within 1° C, the status will be: “Calibration OK”.
When sensor readings differ more than 1° C, the status will be: “Calibration Check x” (where x is the number of invalid
sensor readings).
Figure 3-1 below shows the status of sensors and their calibration.
FIGURE -: SENSOR AND CALIBRATION STATUS
CHAPTER 3: OPERATION
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Figure 3-2 below shows sensor port information:
FIGURE -: SENSOR PORT INFORMATION
3.1.5 RE-CALIBRATION DETAILS
If the NIST sensors are detected as out of calibration, they can be replaced, or they can be re-calibrated. There is also an
offset setting in the web UI that can be used to offset the value. This is covered in the Gateway manual.
3.1.6 GET SNMP OID
The GET SNMP OID button, shown in Figure 3-3 below, allows you to view all of the Temperature sensors OIDs.
FIGURE -: GET SNMP OID BUTTON
CHAPTER 3: OPERATION
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From the page shown in Figure 3-3, you can view and configure the sensor options.
Sensor Name
The sensor can be named as needed for the application.
Status
When communication with the temperature sensor is lost, the status of the temperature sensor is changed to sensorError.
When communication with the temperature sensor is reestablished, the status will be determined by comparing the
Degree to the high and low thresholds.
Sensor Reading
The current sensor reading.
Sensor Currently
Displays the sensor’s current status.
Thresholds
You can re-configure the Thresholds for each sensor state. After changing a threshold value, click “Save” for the changes
to take effect.
An example of threshold settings is shown in Figure 3-4.
FIGURE -: THRESHOLD SETTINGS
CHAPTER 3: OPERATION
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3.1.7 ADVANCED TAB
Figure 3-5 below shows options on the Advanced Tab.
FIGURE -: ADVANCED TAB OPTIONS
Degree Type
The Degree Type can be set to Fahrenheit or Celsius. The system stores the thresholds for both Celsius and Fahrenheit
independently, allowing you to switch between the two degree types. When the Degree Type is changed, all threshold
fields will change their values automatically.
Reading Offset
The Reading Offset parameter can be used to calibrate temperature and humidity sensors. For example, if the actual
reading of a sensor is 28 degrees Celsius and the Reading Offset is set to 2, the temperature will be displayed as 30
degrees Celsius.
Ream
The Rearm parameter is useful for sensors whose values can vary, such as temperature and humidity sensors. It is used
to prevent the sensor from rapidly changing between two states. For example, if the Warning High threshold for the
temperature sensor is set to 80 degrees and the sensor varied between 79 and 80, there would be a large number of
emails, traps, and events logged. The Rearm parameter prevents this by forcing the temperature to drop by the Rearm
value before changing the state back to normal. In this example, if Rearm is set to 2 then the sensor would have to drop
from 80 down to 77 before the status would change from “Warning High” back to normal.
CHAPTER 3: OPERATION
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Calibration Factor
This is a Calibration tool. If you wish to calibrate the temperature sensor, for example, you could enter an offset value of 5.
In this example, if the sensor reads 20 degrees then it would record as 25 degrees. This figure can also be a minus figure
(for example,. -5 would show 15 degrees instead of 20).
Data Collection Type
This refers to the data collection from the sensor and how the data is then displayed on the graphs. There are four options
for the collection of data: Average, Highest, Lowest and Instantaneous. The default setting is “Average.”
When the data collection type is set to “Average,” the averaged value between 2 graph intervals is stored, and output
graphs for the daily, monthly, and yearly all have the same size on the screen. For the daily graph, each data point on the
graph is one data point collected from the sensor. But for the monthly and yearly graph, in order to display more data into
the same size as the daily graph, some consolidation on the data is needed. One data point on the monthly and yearly
graph is an average of the sensor data in a range.
The maximum and minimum values showing on the monthly and yearly graphs are the value of this consolidated data
and not the raw data over that period of that time. The When the Data Collection Type is set to the Highest setting,
you will get the graphing output displaying the sensors highest average readings during sampling. This is the same for
the Lowest setting (lowest average). With the Instantaneous setting you can store the actual value of the sensor at the
sampling interval without averaging.
Enable Calendar
This allows you to schedule when the notifications will be active.
Graph Enable
In order to save the data from the sensors on the unit you will need to enable the Graphing feature on the unit. You need
to change the “Enable Graph” to the On position and click on the Save button to enable the graphing.
Note: You could also enable the graphing from the Summary page.
CHAPTER 3: OPERATION
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Filter Status
The Sensor Filter Status is a feature that you can Enable or Disable. When enabled, it will check the sensor status. If the
status of the sensor changes very rapidly, it will report how many times the sensor status changed, instead of having
multiple separate entries in the syslog. When enabled, this will report the changes and status of a sensor only once.
3.1.8 EXAMPLE OF NIST SENSOR ALERTS
Figure 3-6 below is an example of the NIST2 sensor with a temperature sensor value difference of more than 1° C.
FIGURE -: NIST SENSOR ALERT EXAMPLE
Figure 3-6 shows a Temperature Sensor error. This example shows that two sensors are working. The calibration status is
“Calibration Check 1,” which indicates that one value pair difference is more than 1° C.
CHAPTER 3: OPERATION
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