Bacharach H25-IR manual CAL Factor, Material Required, Procedure

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H25-IR

Calibration

 

 

3.4 CAL Factor

The factory default CAL Factor of 1.000 will provide the level of accuracy as stated in Section 7 Specifications for all gases.

The CAL Factor can be changed for the following two reasons:

•Allow the instrument’s internal leak source to be used to calibrate the instrument, regardless of the gas being measured

•Improve the accuracy of ppm measurements

Leak-rate accuracy can be maintained by periodically calibrating the instrument on the gas being measured. If the instrument’s internal calibration gas is the same as the gas being measured, then it is a simple matter of calibrating the instrument using the internal leak source. When measuring a gas that is not the same as the instrument’s internal calibration gas, then there are two options for maintaining accuracy. The instrument can either be calibrated using an external leak source, or the CAL Factor can be adjusted to make the internal leak source simulate the gas being measured as described in Section 3.4.1.

The CAL Factor can also be used to improve the accuracy of ppm measurements as described in Section 3.4.2.

3.4.1Simulating Other Internal Leak Source Gas Types Using the CAL Factor

When measuring the leak rate of a gas that is not the same as the instrument’s internal calibration gas, the CAL Factor can be adjusted make the instrument’s internal calibration gas simulate the gas being measured. This allows the operator to calibrate the instrument using the internal leak source, regardless of the gas contained in the leak source. Note that this procedure is not necessary for single-gas instruments.

Material Required:

•Calibrated External Leak Source set up for 5 to 10 times the leak rate that the instrument is expected to detect

IMPORTANT! Remember that the accuracy will not be better than that of the external leak source used for calibration.

Procedure:

1.Turn ON the instrument and allow it to warm up for 30 minutes before proceeding.

2.Program the instrument for the Gas Type contained in the external leak source (refer to Section 2.4.1 Gas Type).

3.Verify that the current CAL Factor is set to 1.000 by selecting the Main Menu > CAL DATA > CAL FACTOR function. If necessary, reset the CAL Factor to 1.000. Refer to Section 3.4.3 Adjusting the CAL Factor.

4.Perform an internal calibration in the normal way using the internal leak source (refer to Section 3.2 Internal Calibration). Note that it doesn’t matter that the gas in the internal leak source doesn't match the Gas Type entered in Step 2.

5.Press the MODE key to place the instrument into its Measure mode.

6.Measure the leak rate of the external leak source and record the displayed reading.

Instruction 3015-4342

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Contents Infrared Refrigerant Gas Leak Detector H25-IRRegister Your Warranty by Visiting WarrantyTable of Contents Parts and Service Hazard Symbols Safety PrecautionsAC Power and Grounding IntroductionExplosive Atmosphere CleaningWorking Inside the Instrument Misuse and Modifications to Instrument Case of MalfunctionUnpacking and Initial Checks Ordering InformationFeatures and Capabilities Leak Rate = Flow Rate x Gas Concentration Functional OverviewFront View Names and Functions of ComponentsRear View Interior Standard Probe with LED and Programmable Pushbutton Standard ProbeSmart Probe Smart Probe Keylock Function System Menu Menu SystemConnecting the AC Power Cord Connecting the ProbePreparing for Operation Turning on the InstrumentMain Menu System Setup Menu System SetupGas Type Leak Units4 4-20 mA Loop RelaysReset Defaults Pchk ModeBrightness ClockRange Configuring the Setups FunctionSetup Name Setpoint Feedback ModeSearch Auto Zero CalibrationExternal Relay Connections Typical Relay 1 Wiring4-40 mA Current Loop Connection MA Current Loop ConnectorPreparing for Operation H25-IR Selecting Internal or External Calibration CalibrationInternal Calibration Selection Calibration Data MenuExternal Calibration Selection and Setup Internal Calibration CALExternal Calibration Material Required ProcedureCAL Factor Improving PPM Measurement Accuracy using the CAL Factor Restoring Factory Calibration Adjusting the CAL FactorCalibration H25-IR Power Using the H25-IRInitial Setup OperationRange Selection Setup SelectionSearching for a Leak Volume AdjustmentMeasuring the PPM Level Measuring the Leak RateLog Menu Logging Measured ReadingsWorking with Logged Measurements Clearing the Log What is PCHK? What to Do when a Fault OccursDiagnostics Menu RS-232 CommunicationOperation H25-IR Sensor Data MaintenanceDiagnostics Menu Last Fault IR Emitter Factory MenuPressure Factory Factory MenuLeak Rate Auto GainLeak Gas Leak TempSensor Cal Leak TempcoFirmware Model SelectProbe Type Items Required Flashing MemorySelect Setup Communications Select File Load Flash Image Removing the Top Cover Part ReplacementProbe Tip Filter & O-Ring Replacement Fuse ReplacementInternal Filter Replacement Replacement Parts Parts and ServiceUnited States Service CentersCFCs, HCFCs, HFCs and Halogens SpecificationsSpecifications H25-IR Continuous Appendix a Factory DefaultsAppendix a H25-IR H25-IR Appendix a Headquarters Hunt Valley Circle, New Kensington, PA
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