CIMScan® Sensor Calibration Verification and
Contents
1. 1 0000 0 000 d None 1 0000 0 000 f 1 0000 0 000 1 0000 0 000 As with the DA 12 16 a precision instrument standard is required to perform the calibration check and adjustment Again the following describes the steps for adjusting a temperature sensor but the basic procedure is the same for any type of sensor The calibration process starts by positioning the temperature probe from the calibration instrument in close contact with the sensor being calibrated If the sensor is in a glycol solution the probe tip should be immersed in the solution with the sensor Wait for the measurement on the instrument to stabilize and then follow the instructions below 1 Select the Pod to which the sensor to be adjusted is connected This will display the channel information for that Pod in the grid at the bottom of the display 4 Select the channel to which the sensor to be checked is attached Make sure that the Offset Trim checkbox is checked Enter the current measurement from the calibration instrument in the Output field Click on the Set button to associate the current Input with the Output just entered A new offset value will be calculated and displayed as shown above Click on the Apply button to update the calibration settings in the channel grid oe a a The Calibration tab will be displayed whenever Calibration Record contains data Click on this table to verify that the2. cases sensors in a typical monitoring system have alarm limits associated with them If these limits are fairly close 5 of span to the calibration check value an offset trim is probably acceptable If on the other hand measurement accuracy must be maintained across the sensor s full scale a 2 point calibration must be done This requires the adjustment of both the scale slope of the calibration curve and the offset To accomplish this the sensor needs to be removed from its normal environment and placed in a chamber or other device where the environment can be precisely controlled A hot and cold bath or the electronic equivalent is usually used to calibrate temperature sensors Humidity and CO2 sensors require a chamber that must be adjustable to two calibration levels Pressure sensors are usually calibrated utilizing a stable pressure source and a precision meter Voltage and current inputs require a calibrator which produces a precision voltage or current output The chambers required for humidity and CO2 sensors are often large consequently these sensors are usually returned to the factory for 2 point calibration The other sensors can be easily field calibrated which usually takes about an hour to an hour and a half to perform This includes time required to set up the equipment remove and reinstall the sensor and perform the actual calibration A 2 point calibration begins by placing the sensor being calibrated in a stable
3. CIMScan Sensor Calibration Verification and Adjustment Procedures March 17 2011 This document describes how to perform sensor calibration verification and offset trim using one of the available service tools for either the DA 12 16 Monitoring Station or a DA 06 eLink Controller An overview of the theory behind sensor calibration is presented at the end of this document CIMScan Remote Device Service Tools A service tool is available for all CIMScan remote devices The service tool software comes pre installed on a Windows netbook Two USB cables are also included for connecting the netbook to the appropriate device DA 12 16 67 76 DA 06 07 Monitoring Station Cl 83 Netbook Computer eLink Controller Receiver USB Cable USB Cable To I O Pods Sensors Creating a Calibration Record The service tool software now supports the automatic creation of a calibration record The record can be viewed at any time by clicking on the Calibration tab DA Series Monitoring Station Service Tool H Serial Name ValueBefore Scale Offset ValueAfter Scale Offset 1 28762C350100008F Freezer F1 22 9 1 0000 0 400 23 0 1 0000 0 500 Settings Before Calibration Jt on After Calibration Erase All Copy BB Station Ene Refresh Reset E xit Connections BB Wireless 113 Refres es E 1 A new entry in the calibration record is generated whenever a user updates the calibration setting for a particular se
4. Upper Calibration Value Once both values have been acquired the service tool can be used to calculate both the scale and the offset for the sensor The 024 6 8 10 scale is actually the slope of the line between the upper and lower calibration INPUT points and the offset is the value of the Y axis intercept environment at the lower end of its range Once the output from the sensor 10 stabilizes the environment should be measured with a NIST traceable 8 Senos instrument The user should then enter this value in the Lower Calibration ai 6 Ki Value box in the station s service tool and click the Set button to acquire the A unscaled value from the sensor Next the process should be repeated for the 2 a 0 The calibration values for all Cl series plug in sensors are stored in the sensor itself These settings are stored in the eLink when Pods are calibrated Copyright 2011 by CiIMTechniques Inc 1215 Prince Street Beaufort SC 29902 6
5. al sec 60 Reporting mterval updates 1 Host comm loss timeout sec 120 Sensor comm loss timeout sec 300 Do alarms O no 1 yes 1 Reporting mode 0 to 7 7 Beeper O silent 1 actiyg 1 Cl 83 Outgoing Messages Receiver To oiher Sensors USB Cable Connect the sence tool USE cable to the computer and the cable from the DA port directly to tha Monitoring Station being serviced Early service cables had two USB connectors Connect both of thase to the computer if a CI 83 wireless sensor m the monionng stabon and connect it to the Click on the Connections button fises me seeen itemari red diek Connect to set the COM ports if necessary Flyer limit O none Filter size 1 Firmware Battery Server port Station COM Port E S IP ea dess Sensor COM Port 11 Local port Apply Cancel Local IP Subnet bits rls ee The tables below provide the Information to determine the numeric value to us for cortain encoded satinga fields REPORTING MODE SETTINGS OP 05 MODE SETTINGS Click in the Refresh button to update the service tool in th 2 LI numbers in the Reporting Mode OPOS Made field Bn field 113 Coun O Reset Reties 0 Reset Values O Reset Incoming Messages Cout O Reset Tash O Reset Station Statistics Time since last m g mint 39 Active sensors 1 Bulfid measurem
6. bilized value on the calibration instrument in the Desired Value field Click on the Set button to associate the Desired Value with the Current Value A new offset value will be automatically calculated and displayed Verify that the current value is producing the expected results by clicking on the Set button Click on the Submit button to save the calibration settings and close the dialog ey oY el ee You can select the Calibration tab to make sure that a new entry containing the settings was appended to the calibration record Calibration Verification with the DA 06 Service Tool Set up the DA 06 Service Tool as described in the DA 06 user s manual and then select the Pods tab This will produce the display shown below DA O6 eLink Service Tool PodNet File Setup elink Diagnostics About Enter the ta rget value Station Pods Traffic Active Status Type Addr Serial Number 0 004439756400001 00 0 Calculating w Offset Select the Pod to check sal zs Na 0044975640000400 Input 0044975640000500 Scaled Value K 0 SSS al Click Set to get the current input value 229 231 VUAJ OtUUUUOUT 5 Output J OK 0 0044975640000900 hiai iis Output 1 0000 0 200 0 0044975640000C00 Scale q Offset 0 0044975640000000 0 0044975640000 00 M Offset Trim Apply 0 0044975640000F00 fags Average Input Hi Limit Scale Offset 15 2957 15 31 07 Stats
7. ents 85 Station s Date and Tine Date 03 16 11 Time 083205 Set Refresh Reset Exit Click on the Connections button of either the Station or Wireless indicators ad red This will allow you to select the appropriate COM ports for the cable that you are using Next connect the service tool cable to the DA 12 16 as shown in the diagram on the display above Click on the Refresh button to update the service tool with the DA 12 16 s settings and then select the Sensor tab as shown for 3 above This will display the sensors settings page 2 DA Series Monitoring Station Service Tool Station Sensors Alarm Limits Statistics OP 05 Wireless Sensors H Serial Number 7 28762C350100008F Click on the row containing the sensor you want to verify 1 Name Type Scale Offset Timestamp Average Current Alarm Disp DP 2800 1 0000 0 000 07 18 41 23 0 23 1 OK 0 Calculate Scale and Offset 28 762C3501 00008F Calculating New Offset Click on the Calibrate button to display the calibration dialog os Submit Cancel Remove Add New Calibrate LogMea E Station Connections a BB wireless Check Offset Only Total 0 NoTotiy Retresh Click Set at any time to apply the Scale and Offset to the Input and display the result in the Output An indicator will flash whenever the sensor input is updated 113 Refresh Reset Exi
8. htly due to the aging of its components This change can be detected by comparing the value produced by the sensor with the output from a precision instrument calibration Standard whose probe has been placed in the same environment as the sensor 02 4 6 8 10 The instrument should have been recently calibrated usually within one year INPUT 5 OUTPUT O N AO Scale 1 Offset 0 with a standard traceable to the National Institute of Standards and Technology NIST The difference between the outputs from the sensor and the standard error may be acceptable in which case no adjustment needs be made If on the other hand the value exceeds the limits of error for the particular application the scale and offset calibration factors for the sensor must be adjusted Two types of adjustment are possible The easiest is to 10 simply add the error value determined during the calibration check to the 8 sensor s offset This will force the sensor s output to the value that was a 6 produced by the standard at the value being checked From then on all outputs gt 4 E from the sensor will have this correction added to them This is called an offset 2 2 en trim and usually requires about 20 minutes to perform The chart to the right shows how and output of 6 is produced with an input of 4 and an offset of 2 02 4 6 8 10 The amount of offset trim can be easily determined using the monitoring INPUT station s service tool In most
9. nsor using the Calibration Control Panel in the service tool The serial number and name of the sensor if available along with the measurement value and settings before and after calibration is contained in the record Users can delete a row in the record at any time by selecting the row clicking on it and then clicking on the Delete button The entire record can also be erased by clicking on the Erase All button The record including the headings can be copied to the Windows clipboard by simply clicking on the Copy button This will allow pasting the record into a Word document or Excel spreadsheet The calibration record is automatically saved each time it is updated to a comma separated text file called DACal csv located in the same folder as the service tool program typically in a folder named Program Files CIMTechniques This file can be easily imported into an Excel spreadsheet for reporting purposes Calibration Verification with the DA 12 16 Service Tool Using the DA 12 16 Service Tool to check and adjust sensor calibration is very straightforward and easily done First connect the service tool cable to an available USB port on your computer and start the service tool program The screenshot below shows the tool s sign on display r DA Series Monitoring Station Service Tool A Click here to clear all of the statistics below Cex Station s mac addr 00 20 44 48 45 D5 Sensor update interv
10. record has been updated correctly Calibration Report An Excel spreadsheet is available that can be used to generate a calibration report with the data contained in the Calibration Record on the service tool The screenshot below shows the spreadsheet A B c D E F G H I J J a z F l 1 CIMScan Calibration Verification and Adjustment Report 2 7 Model Number Serial Number Calibration Date 9 10 Serial Name ValueBefore Scale Offset value After Scale Offset Notes u 1 rr a ee ee eee eee eee eee m y y T o S e mo e e T e T S e 5 J o o o e o T T T S o wml e o S T T S e WO S y y T S S e WO a GQ S e mm a a You can copy the calibration record from the service tool and paste it into the data area at A10 Overview of Sensor Calibration in a CIMScan Monitoring System All sensors or sensor inputs in a CIMScan system can be calibrated in the field by adjusting their scale and offset values A typical Cl series temperature sensor is manufactured to produce an absolute output value in degrees Celsius This value is initially multiplied by a scale of 1 000 and an offset of 0 000 is added in the monitoring station The calibration scaling can be represented graphically using 10 simple X Y chart as shown in the graph The scale is actually the slope of the line used to perform the calibration transformation 1 in this case Over time the output of the temperature sensor may change slig
11. t A precision instrument which has been recently calibrated to NIST traceable standards should be used to perform the calibration check and adjustment Although what will be described here is for a temperature sensor the basic procedure is the same for any type of sensor The calibration process starts by positioning the temperature probe from the calibration instrument in close contact with the sensor being calibrated If the sensor is in a glycol solution the probe tip should be immersed in the solution with the sensor Wait for the measurement on the instrument to stabilize and then follow the instructions below Calculate Scale and Offset Wait until the input has been 9908F updated then click on the Set Ca ulating New Offset Set 231 235 Current Value Desired Value Verify the calibration by clicking on the Set Value After Scaling button Set 231 235 Input Output 70000 0 400 Click on the Submit button seale to store the new offset and close the dialog Offset Submit Cancel Read the current value from the meter being used to do the calibration and enter it here A new offset will be calculated and displayed here 1 Click on the row containing the sensor whose calibration is to be verified and adjusted 2 Next click on the Calibrate button to display the calibration dialog 3 Make sure that the Offset Only checkbox is checked Enter the sta
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