Bacharach H25-IR Operation & Maintenance Manual

Also see for H25-IR: Product catalog Specifications Instruction

Contents

Bacharach H25-IR Operation & Maintenance Manual Manual pdf 49 page image

H25-IR OperationInstruction 3015-5286 43move the blinking cursor across the screen to highlight the digit to be modified, and then using the Up andDown buttons to modify that digit. Press ENT to save the new ambient pressure value.Tip: To convert inHg into PSIA, multiply inHg by 0.491. For example: 30.00 inHg x 0.491 = 14.73 PSIA.5.2.6.2 Flow Rate Sensor Calibration Screen (Factory Calibration)Set the default factory calibration flow and pressure drop values by first performing an internal calibration asdescribed in Section 3.2 Internal Calibration.INT: Flow rate in moles/minute for both the Search and Measure modes after performing a calibration using theinternal leak source, along with showing the manifold’s pressure drop.FAC: Flow rate and pressure drop values that are currently stored as the default factory calibration values.These values are used to validate calibrations performed by the operator. A calibration error will occur if theoperator’s calibration and factory values differ by more than 20%.Press ENT to store the internal calibration numbers as factory values. These are the calibration values that arereset when RESTORE FACTORY CAL is selected from the CAL Data menu (refer to Section 3.5 RestoringFactory Calibration).5.2.6.3 Box Temperature Calibration ScreenIn order to accurately determine when the internal leak source is running out of gas, the enclosure’stemperature sensor must match the temperature of the leak source, as computed using the pressure/temperature curve for the gas contained in the leak source and the measured pressure of the leak source.Before making this adjustment, all enclosure lids must be in place and the instrument must be allowed to warmup for at least 30 minutes.Next, adjust the value displayed on the Box Temperature Calibration screen to match the calculated “LEAK”temperature as displayed in the lower-right corner of the screen. In the example above, set the box temperaturefor a reading of 28.41 by using the Left and Right buttons to move the blinking cursor across the screen tohighlight the digit to be modified, and then using the Up and Down buttons to modify that digit. Press ENT tosave the new box temperature value. Note that the “OFFSET” value is the difference between the boxtemperature sensor reading, and the box temperature reading adjusted to match the leak source temperature.5.2.7 Model SelectThe Model Select function is used to set up the instrument’s operating characteristics as defined by its PartNumber (refer to Appendix “A”). Use the Up and Down buttons to select the appropriate Part Number (asmarked on the instrument’s rear panel). Press ENT to activate the selection.S-Mpm/dP M-Mpm/dPINT 0.0177/-1.33 0.0100/-2.28FAC 0.0177/-1.33 0.0100/-2.28ENTER TO SAVE INT AS FACTORYENTER BOX TEMP degC28.41OFFSET=0.18 LEAK=28.41MODEL SELECT< 3015-5260 R134A3015-5263 R600A< 3015-5266 SF6