Vishay Precision Group BLH 325 Operator'S Manual Download Page 1 | Manualshive

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BLH

MODEL 325

Weigh Systems Calibrator

Operator’s Manual

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ON TE

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BLH

MODEL 325

Weigh Systems Calibrator

Operator’s Manual

TM026

RevC

6/1/11

Doc 35120

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Summary of Contents for BLH 325

Page 1: ...SYSTEM CALIBRATION TECHNOLOGY BLH MODEL 325 Weigh Systems Calibrator Operator s Manual SYSTEM CALIBRATION TECHNOLOGY BLH MODEL 325 Weigh Systems Calibrator Operator s Manual TM026 RevC 6 1 11 Doc 35120 ...

Page 2: ...ar purpose BLH shall not be held liablefor errors contained herein or for incidental or consequential damages in connection with the furnishing performance or use of this publication or its contents BLH reserves the right to revise this manual at any time and to make changes inthe contents hereof without obligation to notify any person of such revision or changes Call 781 298 2216 for BLH Field Se...

Page 3: ...mote Sense Lead Connections 2 1 2 3 3 Signal Connections 2 2 SECTION 3 Operation 3 1 3 1 GENERAL 3 1 3 2 FRONT PANEL CONTROL 3 1 3 2 1 Millivolt Per Volt Selection 3 1 3 2 2 Input Output Resistance Selection 3 1 3 2 3 Vernier Adjustment 3 2 3 3 CALIBRATION 3 2 3 3 1 Dead Weight Signal Calibration 3 2 3 3 2 Establishing Zero 3 2 3 3 4 Calculate the Interpolated Span Value 3 3 3 3 5 Entering a Span ...

Page 4: ...excellent choice for calibrating process weighing instruments and transmitters 1 2 SPECIFICATIONS Output Accuracy 0 02 of selected range Accuracy Stability 0 5 and lmV V steps less than 0 01 in 24 hours less than 0 02 in 1 year 1 5 thru 3 5 mV V steps less than 0 005 in 24 hours less than 0 01 in 1 year Zero Stability less than 3 uV Span TC 15 ppm degree C Input Impedance Excitation adjustable to ...

Page 5: ... any part to misuse negligence accident or any cause other than normal and reasonable use nor shall it apply beyond their normal span of life to any materials whose normal span of life is shorter than the applicable period stated herein In consideration of the forgoing guarantees all implied warranties are waived by the Buyer BLH does not guarantee quality of material or parts specified or furnish...

Page 6: ... clean dry vibration free area that is exempt from unusual temperature fluctuations Figure 2 1 Model 325 Outline Dimensions 2 3 ELECTRICAL INSTALLATION 2 3 1 Excitation Lead Connections Power for the 325 is supplied by the instrument indicator transmitter etc being tested Simply connect the instrument excitation output to the 325 excitation input binding posts as shown in Figure 2 2 black and gree...

Page 7: ...as shown in Figure 2 2 Figure 2 2 Typical Electrical Connections NOTE The Model 325 polarity designations are designed to simulate compression type systems To simulate a tension system the signal leads white and red may have to be reversed NOTE BLH load cell wiring color code conventions may differ from other load cell manufacturers ...

Page 8: ...ntiometer combination for vernier adjustments 3 2 1 Millivolt Per Volt Selection Use the 8 position rotary switch to select 0 0 5 1 0 1 5 2 0 2 5 3 0 and 3 5 mV V output ranges Each range supplies a highly accurate constant output 3 2 2 Input Output Resistance Selection The 3 position resistance ohms selection switch provides 3 resistance ranges to match different transducer specifications Traditi...

Page 9: ...t the instrument span selector consult instrument operator s manual for instructions until the readout is correct If the system full scale rated output is 2 mV V midrange linearizing calibration adjustments can be made by selecting 0 5 1 and 1 5 mV V steps and adjusting the readout to display 25 50 and 75 of capacity re check 0 and full scale displays afterwards Similarly for a 3 mV V system linea...

Page 10: ...ctions described in this chapter pertain to digital indicator transmitters that can acquire a dead weight zero in place Analog indicators may require a different procedure consult operator s manual supplied with unit NOTE Make sure the instrument is in gross mode with all automatic functions turned OFF and the vernier adjustment OUT before attempting calibration NOTE After the weighing system is r...

Page 11: ...necessary use the interpolation tables described in paragraphs 3 3 3 and 3 3 4 to determine the correct selection 2 Change the vernier adjustment bat handle switch to the IN on position 3 Observing the indicator display rotate the potentiometer switch until the point of coincidence is achieved ...

Page 12: ...3 Edgewater Drive Norwood MA 02062 USA Phone 781 298 2200 Fax 781 762 3988 www vishaypg com ...

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