Data Validation Types in the 8864

There are currently five different validation types in the 8864 data controller. These multiple methods of validation for data are a necessity to accommodate the variety of existing regulations. A table summarizing these validation types is provided below.

Methodology 8864
Validation Type
StackVision Validation Type
Table 1: Data Validation Type Summary
Arithmetic Averaging with Percentage Based Validation 0 N
Integrated Averaging with Quadrant Validation 1 Y
Integrated Averaging with Quadrant Validation (omit grace period) 2 G
Arithmetic Averaging with Quadrant Validation 3 A
Arithmetic Averaging with Quadrant Validation (omit grace period) 4 4


It is important to understand the methodology of each of these types to ensure the correct one is selected for the regulatory requirements. For all validation types, the base average is built using the 1-second instantaneous readings. An arithmetic average is calculated using the formula of:



When performing the calculation, the data controller only includes valid readings unless the average is invalid, in which case all readings are included. Note: For simplicity, time offline is not being considered.
 

Type 0 or N Validation

For type 0 or N validation, the base average is used to build the ext. 1 and ext. 2 averages. It is important to recognize the ext. 2 average is not built from the ext. 1 average. Also, the average interval can be set to any value so long as each one is a multiple of the previous. The base, ext. 1, and ext. 2 averages are only valid if a set percentage of the values are valid. The default percentage used is 75.



This validation method is typically used for non-harmonized Part 60 parameters or parameters not related to compliance.
 

Type 1 or Y Validation

In type 1 or Y validation the averaging intervals are pre-defined. The 1-minute base average is valid so long as at least one of the readings is valid. The base average is then used to build the 15-minute ext. 1 average. The ext. 1 average is valid so long as one of the minutes is valid. However, this method is “integrated averaging” meaning the ext. 1 average is used to build the 1-hour ext. 2 average instead of the 1-minute base average. The ext. 2 average requires all four ext. 1 averages to be valid unless there is maintenance or calibration during the hour, in which case only two ext. 1 averages are required to be valid.

Additionally, this method requires a daily calibration to be passed every 26 clock hours with an 8-hour grace period after start-up for the data to be valid.



This method is rarely used, and only applies for Part 75 parameters with a start-up grace period and where the 1-hour average should be built directly from the 15-minute averages.
 

Type 2 or G Validation

Type 2 or G validation is nearly identical to the 1 or Y type except there is no start-up grace period. However, there is still the requirement to pass a daily calibration every 26 hours. It is almost never used and would only apply for Part 75 parameters with no grace period and where the 1-hour average should be built directly from the 15-minute averages.


Type 3 or A Validation

Type 3 or A validation is similar to type 1 or Y, the difference is the 1-hour ext. 2 average is built from the base average and not the 15-minute ext. 1 average. This is the typical validation methodology for Part 75 parameters with a start-up grace period or any Part 75 parameter in an 8832 data controller.


Type 4 Validation

Type 4 validation is almost the same as the type 3 or A except there is no start-up grace period nor 26-hour calibration requirement. This validation method is new to the 8864 data controller and used for harmonized Part 60 parameters and Part 75 parameters with no periodic calibration requirement. For additional information regarding the latest version of the 8864 Data Controller, please refer to the 8864 Data Controller User Guide (requires login).


Contact the ESC Support Team for help understanding your data validity.
 512-250-7901  •  support@envirosys.com

Contact the ESC Sales Team to inquire about purchasing an 8864 or any of the ESC Engineering Services.
512-250-7902  •  sales@envirosys.com
 

The ESC Engineering Staff    Published: 8/20/2018 2:46:22 PM

Questions about the ESC DAS?

We'd love to answer your questions.

Contact Us

New to Data Acquisition Systems?

Check out our helpful animation that teaches the basics of

What is a DAS?