Sensotec HH Manual 

2080 Arlingate Lane, Columbus, Ohio 43228 USA • (614)850-5000

Columbus, Ohio 43228 USA Copyright © 2002 by Sensotec, Inc. all rights reserved Telephone: (614)850-5000 FAX: (614)850-1111 Toll Free: 1-800-848-6564 E-mail: [email protected] WWW: http://www.sensotec.com Model HH Instruction Manual Document Part Number: 008-0139-00 Rev. B: March, 2003 IMPORTANT! IT IS RECOMMENDED THAT YOU READ THIS DOCUMENT THOROUGHLY BEFORE APPLYING POWER TO THIS UNIT. THIS DOCUMENT CONTAINS INFORMATION ON WIRING, CALIBRATION, AND USE OF FEATURES. Sensotec continually improves its products, and thus the information herein is subject to change without notice.

1.2 Specifications . . . . . . . . . . . . . . . . . . . . . 6 1.3 Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Chapter 2 SETUP 2.1 Initial Setup . . . . . . . . . . . . . . . . . . . . . . . 11 2.2 Transducer Hookup. . . . . . . . . . . . . . . . . 12 2.3 Calibration. . . . . . . . . . . . . . . . . . . . . . . . 13 WARRANTY 15

Chapter 1 INTRODUCTION 1.1 Overview The Sensotec Model HH is a complete hand-held portable signal-conditioner/indicator for use with strain-gage trans- ducers. The instrument provides an excitation power sup- ply for such transducers, amplifies the transducer’s output, and indicates this reading in engineering units. It can indicate this reading in a continuous fashion (tracking mode) or display only the highest reading (peak mode) using a switch to make the selection. Other features of the instrument include: • 3-1/2 digit liquid-crystal display • use of a standard, 9-volt battery • low-battery warning indication Though the instrument is small, it is a full signal-condi- tioner, providing adjustment for zero, span, scaling and switch-selected gain. It is usable with a wide variety of strain-gage transducer types, and is the ideal instrument for the those who must travel and take readings from a wide variety of transducers.

1.2 Specifications SIGNAL CONDITIONER Excitation Voltage to transducer: 2.46 VDC Minimum Transducer Impedance: 120 ohms Input Signal Sensitivity for Full-Scale Indication: 0.5 to 8.0 mV/V Peak Detector Bleed-Off Rate < 0.01% per second DISPLAY Type: 3½ LCD, plus optional dummy zero Low-Battery Indicator: yes Over-Range Indicator blinking digits Digit Height: 0.5” Conversion Rate: 3 readings / second PHYSICAL Size: 3.6” W x 6.75” L x 1.75” H Enclosure Material: ABS impact-resistant plastic Transducer Connector: four binding posts capable of spade lugs, banana plugs, alligator clips and stranded or solid wire Power Supply: 9-volt battery (NEDA 1604) Battery Life: 15 hours minimum with 350-ohms transducer impedance

1.3 Layout 1.3.1 Front Panel Controls / Indicators [ON/OFF] Switch This switch controls power to the instrument from the bat- tery. [SHUNT CAL] Switch This switch connects the instrument’s shunt calibration resistor to the transducer and is used during setup. See “SETUP” on page 11 for more information. [PEAK/TRACK] Switch This switch selects the mode of operation of the instru- ment. In the TRACK mode, the instrument's display will continuously follow the transducer reading. In the PEAK position, the instrument will retain and display the value of the most positive reading detected during operation. To reset the peak, switch the [PEAK/TRACK] switch to the TRACK position. (A slight decay of the peak value dis- played over an extended period of time is normal). [ZERO] Potentiometer This control is used to obtain a zero indication, thus can- celling drifts or offsets that could exist in the instrument or transducer. [SPAN] Potentiometer This control adjusts the fine gain of the amplifier. It is used to be certain that the reading obtained from any transducer can be scaled to the proper level on the dis- play. “LO BAT” Indicator This indication appears in the upper-left of the display and indicates when the battery voltage is getting low.

Figure 1-1: Layout -IN +IN -EX +EX OFF ON CAL SHUNT TRACK PEAK MODEL HH PORTABLE INDICATOR SPAN ZERO LO BAT

1.3.2 Connection Terminals On the top of the instrument are four binding-post connec- tors for the transducer connections. Labels describe the function of each of the terminals. 1.3.3 Battery Replacement The access door for the battery is located on the rear of the instrument. To replace the battery, slide this door in the direction indicated by the arrow. When changing bat- teries, remove the clip from the battery carefully, in order to protect the wiring. Table 1: Transducer Hookup Instrument Transducer +EX (+)Excitation -EX (-)Excitation +IN (+)Output -IN (-)Output

Chapter 2 SETUP 2.1 Initial Setup If your instrument was purchased simultaneously with a Sensotec transducer, it has already been calibrated to that transducer; you may skip this section. 1) Remove Cover: Remove the rear panel from the instrument by removing the four corner screws and carefully lifting the rear cover. Use caution not to strain the wires running to the battery compartment. 2) Decimal Point Setting: Determine the desired loca- tion for the decimal point on the digital display. See “Printed Circuit Board” on page 14. Connect the proper decimal point jumper as shown. CAUTION! Use only one jumper! 3) Extra (Dummy) Zero: It is possible to have an extra, non-active zero digit at the end of the displayed value. Decide if the extra zero is required on the dis- play. Connect a jumper so that this digit is on or off, as shown in “Printed Circuit Board” on page 14. 4) Coarse Gain: Determine the transducer's full-scale output in milliVolt-per-Volt. “Printed Circuit Board” on page 14 indicates the selections for eight selector switches which set the coarse gain of the instrument. The following table indicates the switch positions needed to accommodate the various mV/V inputs. This completes the initial setup of the instrument. Do not replace the rear panel, yet.

2.2 Transducer Hookup Connect the transducer to the instrument using the bind- ing post connectors shown in “Layout” on page 8. Observe the wiring as shown on the Transducer Informa- tion Sheet provided with your transducer. Turn the instru- ment on and allow the transducer a few seconds to warm up, thus stabilizing any zero shift. Table 2: Coarse Gain Switch Settings mV/V Value Switches on 0.5 1, 2, 3, 7 0.75 1, 3, 7 1.0 1 1.5 3, 5, 7 2.0 2 2.5 4, 7 3.0 3 3.5 6, 8 4.0 4 5.0 5 6.0 6 7.0 7 8.0 8

2.3 Calibration 1) Locate the internal SCALING potentiometer (see “Printed Circuit Board” on page 14). Turn it fully clockwise (about 25 turns). 2) With no load applied to the transducer, adjust the front-panel [ZERO] potentiometer to give a zero indi- cation on the display. 3) Known Load Method: With a known load close to full-scale applied to the transducer, adjust the [SPAN] potentiometer so that the display reads 1999 (or 19990 if the extra digit is turned on). Shunt Calibration Method: An alternative to this step is to use the [SHUNT CAL] switch to simulate a load, adjusting the [SPAN] potentiometer so that the display reads the value cal- culated by the following formula. If an extra zero digit is selected, the display should read: If the extra zero digit is NOT selected, the display should read: These values are normally found on the calibration sheets which are delivered with transducers by most manufacturers. The value of the Shunt Calibration resistor that the manufacturer recommends is also on this sheet. It is important to use the same value of resistor when using the Shunt Calibration Method. Shunt Cal Output (mV/V) × 19990 Full Scale Ouput mV/V ----------------------------------------------------------------------------------- Shunt Cal Output (mV/V) × 1999 Full-Scale Output (mV/V) --------------------------------------------------------------------------------

4) Recheck the ZERO and again apply the known-load or Shunt Calibration. 5) With the full-load applied, adjust the internal SCAL- ING potentiometer to the desired full-scale engineer- ing unit value. If the SHUNT CAL technique is being used, adjust for the value calculated by: 6) Replace the rear panel. Calibration and setup are now complete. Figure 2-1: Printed Circuit Board Shunt Cal Output (mV/V) × Full-Scale Engineering Units Full-Scale Output (mV/V) ------------------------------------------------------------------------------------------------------------------------------------------

Any of our products which, under normal operating conditions, proves defective in material in workmanship within one year from the date of shipment by Sensotec, Inc., will be repaired or replaced free of charge, provided that the buyer (1) promptly notifies Sensotec, Inc. of any such defect; (2) provides Sensotec, Inc. with satisfactory proof of the defect and that the product was properly installed, maintained, and operated within the limits of rated and normal usage; and (3) obtains from Sensotec, Inc. authorization to return the product. Any such product shall be returned with transportation charges prepaid. The replacement product will be shipped F.O.B. our plant. The remedy set forth herein does not extend to any product or part thereof which, under normal usage, has an inherently shorter useful life than one year. The remedy set forth herein does not apply to damage or to defects in any product caused by the buyer’s misuse or neglect, nor does it apply to any product which has been repaired or disassembled which, in the sole judgement of Sensotec, Inc. affects the performance of the product. The remedy set forth herein is the buyer's exclusive remedy, and will satisfy all obliga- tions of Sensotec, Inc. whether based on contract, negligence, or otherwise. Sensotec, Inc. is not responsible for any incidental or consequential loss or damage which might result from a failure of any Sensotec, Inc. product. THIS EXPRESS WARRANTY IS MADE IN LIEU OF ANY AND ALL OTHER WAR- RANTIES, EXPRESS OR IMPLIED, INCLUDING IMPLIED WARRANTY OF MER- CHANTABILITY OR FITNESS FOR PARTICULAR PURPOSE. Obtaining Service Under Warranty Advanced authorization is required prior to the return to Sensotec, Inc. Before return- ing the items, either write to the Repair Department c/o Sensotec, Inc., 2080 Arlingate Lane, Columbus, Ohio 43228, or call (800) 848-6564 with: 1) a part number; 2) a serial number of the defective product; 3) a technical description* of the defect; 4) a no- charge purchase order number (so products can be returned to you correctly); and 5) ship and bill addresses. Shipment to Sensotec, Inc. shall be at Buyer's expense and repaired or replacement items will be shipped F.O.B. our plant in Columbus, Ohio. Non-verified problems or defects may be subject to an evaluation charge. Please return the original calibration data with the unit. Obtaining Non-warranty Service Advance authorization is required prior to the return to Sensotec, Inc. Before returning the item, either write to the Repair Department c/o Sensotec, Inc., 2080 Arlingate Lane, Columbus, Ohio 43228, or call (800) 848-6564 with: 1) a part number; 2) a serial num- ber of the defective product; 3) a technical description* of the malfunction; 4) a pur- chase order number to cover Sensotec, Inc.'s repair cost; and 5) ship and bill addresses. After the product is evaluated by Sensotec, Inc., we will contact you to pro- vide the estimated repair costs before proceeding. The minimum evaluation charge is $95. Shipment to Sensotec, Inc. shall be at Buyer's expense and repaired items will be shipped to you F.O.B., our plant in Columbus, Ohio. Please return the original calibra- tion data with the unit. Repair Warranty All repairs of Sensotec, Inc. products are warranted for a period of 90 days from date of shipment. This warranty applies only to those items which were found defective and repaired. It does not apply to products in which no defect was found and returned as is or merely re-calibrated. Out of warranty products may not be capable of being returned to the exact original specifications or dimensions. *Technical description of the defect: In order to properly repair a product, it is neces- sary for Sensotec, Inc. to receive information specifying the reason the product is being returned. Specific test data, written observations on the failure and specific corrective action you require is needed.

Columbus, Ohio 43228 Tel: (614)850-5000 Fax: (614)850-1111 E-mail: [email protected] http://www.sensotec.com