Bacharach H25-IR manual External Calibration

Page 28

Calibration

H25-IR

 

 

3.3 External Calibration

External calibration uses a customer supplied leak source that matches the gas to be monitored. Properties of the leak source must be entered by the operator using the EXT RATE and EXT GAS TYPE functions as described in Section 3.1.2 External Calibration Selection and Setup. The EXT RATE entry is the number displayed as the “target” value during calibration.

IMPORTANT! The operator is responsible for ensuring that the external leak-rate value has been corrected for daily changes in ambient temperature and pressure at the time of calibration. It is also the operator’s responsibility to ensure that a good calibration has been performed.

1.Turn ON instrument and allow it to complete its 120 second warm-up.

2.Press the front panel CAL button to display the Calibration screen. Note that the display must be reading a leak rate of “0.00” when the CAL button is pressed; otherwise, the message “LEAK RATE MUST BE ZERO TO CALIBRATE” will appear. If necessary, press the ZERO button to zero the gas display before pressing CAL.

0.89TARGET Oz/yr

O/YR R134A

R134A

0.00MEASURED SETUP

O/YR EXT CAL

3.Ensure that the instrument is set up for “EXT CAL” (external calibration) as indicated at the bottom-right of the display. If “INT CAL” (internal calibration) is displayed, perform the procedure in Section 3.1 Selecting Internal or External Calibration and set the Cal Type to External.

4.Insert probe tip into the Calibration Port of the external leak source.

5.The top number of the Calibration screen shows the “target” value (leak source rate), while the bottom number shows the current “measured” value. Keep the probe tip inserted in the Calibration Port for the duration of the calibration process, during which time the instrument performs a calibration at both a high and low flow rate.

0.89

0.89

TARGET

Oz/yr

OZ/YR

R134A

R134A

SETUP

MEASURED

OZ/YR

EXT CAL

6.After the calibration cycle is complete, the new calibration data is saved and the display automatically switches back to the Data Display screen. Note, however, if the PCHK Mode is set to AUTO (refer to Section 2.4.7 PCHK Mode), then a pressure check is performed prior to the display of the Data Display screen.

Oz/yr

R134A

SETUP

SM SRCH

NOTE: After calibration the instrument is automatically placed into its Search mode.

24

Instruction 3015-4342

Page 27 Page 29
Image 28
Page 27 Page 29
Contents H25-IR Infrared Refrigerant Gas Leak DetectorWarranty Register Your Warranty by VisitingTable of Contents Parts and Service Safety Precautions Hazard SymbolsAC Power and Grounding IntroductionCleaning Explosive AtmosphereWorking Inside the Instrument Misuse and Modifications to Instrument Case of MalfunctionOrdering Information Unpacking and Initial ChecksFeatures and Capabilities Functional Overview Leak Rate = Flow Rate x Gas ConcentrationNames and Functions of Components Front ViewRear View Interior Standard Probe Standard Probe with LED and Programmable PushbuttonSmart Probe Smart Probe Keylock Function Menu System System MenuConnecting the Probe Connecting the AC Power CordPreparing for Operation Turning on the InstrumentSystem Setup Main Menu System Setup MenuGas Type Leak UnitsRelays 4 4-20 mA LoopPchk Mode Reset DefaultsBrightness ClockSetup Name Configuring the Setups FunctionRange Feedback Mode SetpointCalibration Search Auto ZeroTypical Relay 1 Wiring External Relay ConnectionsMA Current Loop Connector 4-40 mA Current Loop ConnectionPreparing for Operation H25-IR Calibration Selecting Internal or External CalibrationInternal Calibration Selection Calibration Data MenuExternal Calibration Selection and Setup CAL Internal CalibrationExternal Calibration CAL Factor ProcedureMaterial Required Improving PPM Measurement Accuracy using the CAL Factor Adjusting the CAL Factor Restoring Factory CalibrationCalibration H25-IR Using the H25-IR PowerInitial Setup OperationSetup Selection Range SelectionVolume Adjustment Searching for a LeakMeasuring the Leak Rate Measuring the PPM LevelWorking with Logged Measurements Logging Measured ReadingsLog Menu Clearing the Log What to Do when a Fault Occurs What is PCHK?Diagnostics Menu RS-232 CommunicationOperation H25-IR Diagnostics Menu MaintenanceSensor Data Last Fault Factory Menu IR EmitterPressure Factory Factory MenuAuto Gain Leak RateLeak Gas Leak TempLeak Tempco Sensor CalProbe Type Model SelectFirmware Flashing Memory Items RequiredSelect Setup Communications Select File Load Flash Image Part Replacement Removing the Top CoverFuse Replacement Probe Tip Filter & O-Ring ReplacementInternal Filter Replacement Parts and Service Replacement PartsService Centers United StatesSpecifications CFCs, HCFCs, HFCs and HalogensSpecifications H25-IR Appendix a Factory Defaults ContinuousAppendix a H25-IR H25-IR Appendix a Headquarters Hunt Valley Circle, New Kensington, PA
Top Page Image Contents