Heise PTE-2, Operation And Maintenance Manual

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SECTION 15 n. CALIBRATE BASE UNIT CONT. Obtaining “As found” and “As Left” data procedure consists of
applying precision voltage and current signals to the proper
terminations and reading the values displayed on the HHC
display.
Base unit recalibration is a firmware based, menu driven pro-
cedure that provides prompts on the HHC display directing
the operator to apply precision voltage and current signals to
designated terminals. Recalibration is accessed via the menu
system.
Calibration Function Password
HHC calibration functions are password protected. The pass-
words may be obtained by contacting the factory or download-
ing the” HHC Secure” application from the web site. “HHC
Secure” will generate the HHC’s unique pass codes based on
user input of the base unit serial number. Make a note of these
pass codes
The base unit serial number is needed to determine the pass-
word. To locate the serial number label remove any installed
pressure modules, hold the base unit keypad side down and
look into the module bays. The serial number is also displayed
briefly during HHC base unit power up. The label is located on
the underside of the keypad/front panel section of the base
unit.
Calibration Equipment Required
In order to perform HHC base unit verification and recalibration
a precision voltage and current standard is required. To main-
tain specified accuracy of the HHC base unit, the calibration
standard must exceed the base unit accuracy specification four
times the specification of the HHC base unit. The voltage and
current standard is needed both for documenting calibration
data as well as the recalibration procedure,
The instrument must be capable of providing resolution and
accuracy at least to the following levels;
• SENSOR MODULE INPUT 0 to + 1.00000 ±20uv DC
(0.00002 volt) (required accuracy
±.005%)
• 10 VOLT CALIBRATION 0 to +10.000 ±625uv DC
(0.000625 volt) (stated accuracy
±.025%)
• 30 VOLT CALIBRATION 0 TO 30.000 ±7.50mv DC
(0.0075 volt)(stated accuracy
±.1%)
• 20 ma CALIBRATION 0 to 20.000 ± 1.5ua (0.0000015
amp) DC (stated accuracy
±.03%)
Required Equipment Calibration Module part number
312D224-01
HHC Base Unit Documenting Calibration Data
(As Found and As Left Data)
Documenting the condition of the HHC before and after it is
recalibrated (“As Found” and “As Left”) follows the same pro-
cedure. The operator will verify and document the accuracy of
the DC voltage input, the DC current input and the Channel 1
module input.
The number of points verified when documenting calibration
data varies based on customer requirements. At minimum zero
and full scale values should be documented. Calibration data
must be manually collected and documented. The HHC does
not log its own calibration data.