Teledyne NV-100 User's Manual
Contents
1. achieve this pressure if the oil is clean and fresh and the volume of the system small 1 Check mechanical meter zero with the gauge turned off Set to read ATM if necessary with screw adjust in lower left center of meter 2 Turn on and allow about 30 minutes warm up With gauge tube at atmospheric pressure set the trim potentiometer in the rear marked ATM until the meter needle reads ATM 3 Pump down to 10 microns Hg or lower Allow sufficient time to outgas the tube after exposure to ATMin 2 above Set ZERO adjust trim potentiometer in the rear until the meter reads 0 pressure Calibration is now complete Repeat 2 and 3 if desired for a final trim EXTENSION CABLES A maximum of 12 ft extension may be used provided recalibration of the ATM and span adjustments are accomplished Extension cables are of the type OMS length OFS and are available from Hastings Instruments A 5 wire cable of no less than 18 wire is required Hastings provides an extension of 12 ft 103A PAGE 4 916 19991495 812 9 9NI38 5 9 3Hl 4 dO 5 NI 39055399 JHL 731 25 JHL 40 3915 31150440 JHL NO 37725 1 40 44 3HL 40 3918 SHL NO Q3AN3SHO 319901 H3H10 579 V Ni 3H0SS38d 3Hl OL 3AO8V NMOHS 53579 53811 39nV9 OOI AQ 1 ASN S39nv9 SONILSVH 40 NOILVYSITVD ONIM2. gauge tubes by application of excessive power surges when plugging in or unplugging gauge tubes A delay circuit applies power gently when connected Pins 1 and 2 of the gauge tube activate the circuit and act as the interlock switch Thus the instrument will not operate unless the correct gauge tube is used Troubleshooting the circuit on a bench cannot be accomplished unless these two pins are jumpered at the gauge tube socket or a DV 100 gauge tube is plugged into the socket TROUBLE SHOOTING If troubles develop always try a new gauge tube before suspecting other problems To check gauge tubes for continuity of thermocouples first make sure that the gauge tube is at atmospheric pressure then using an ohmmeter check for continuity between pins 3 5 and 7 Approximately 10 ohms resistance is read between all combinations of these three pins on a good tube If open replace the tube Never check while under vacuum as the ohmmeter may burn out the gauge tube Pins 1 and 2 should show zero ohms Trouble shooting the electronics is difficult because this is a closed loop feed back circuit If circuit problems develop it is best to return it to the factory for repair 103A PAGE 3 CALIBRATION Calibration is relatively easy with this gauge since a pressure of only 10 microns Hg 10 millitor or lower is all that are required It need not be known accurately as long as it is this low or lower good clean dry compound mechanical vacuum pump can
3. 30vV100 H108 1 0333 6 2 YIAN IW OFT 2 4 1 OVA 9I AMVWHId 1 1 103A PAGE 7 103A PAGE 8 Service Form TBE Hastings Instruments RMA 804 Newcombe Avenue contact factory Hampton VA 23669 U S A Telephone 804 723 6531 Fax 804 723 3925 PON J Date Address 7 Describe problem Show a block diagram of your system including unit inlet and outlet pressures Calibration range___ Cablelength Powerlinevoltage Ambient temperature Gas Temperature Other If special modifications have been made by user please describe Application of product being returned Has this product been used with a hazardous material YES NO If YES please list types of gas chemicals common names specific chemical biological materials or other potentially harmful materials exposed to the product during its use attach additional page if necessary PRODUCTS EXPOSED TO RADIOACTIVE MATERIAL CANNOT BE ACCEPTED BY HASTINGS INSTRUMENTS UNDER ANY CIRCUMSTANCES Signature of Hazards Control Officer For questions regarding use of the product and materials in contact with it Name Phone 103A PAGE 9
4. HASTINGS VACUUM GAUGES MODEL NV 100 TELEDYNE BROWN ENGINEERING HASTINGS INSTRUMENTS PO BOX 1436 HAMPTON VIRGINIA 23661 U S A TELEPHONE 804 723 6531 FAX 804 723 3925 TWX 710 882 0085 EASYLINK 62300280 May 1994 VIRGINIA 23661 U S A HASTINGS INSTRU 804 723 6531 103A PAGE 1 Hastings Instruments reserves the right to change modify the design of its equipment without any obligation to provide notification of change or intent to change 103A PAGE 2 GENERAL The Hastings Model NV 100 Vacuum Gauge is a complete self contained instrument with all circuits mounted on the rear of the meter case A remote type DV 100 gauge tube is used as the pressure sensor The instrument measures pressures over the range of 0 1 to 100 Torr utilizing the well known Hastings directly heated thermopile Unlike other Hastings gauges this instrument operates in a constant temperature mode rather than constant applied voltage The changes in power to create a constant temperature rise above ambient are measured by the indicating meter as a function of pressure Corrections for gasses of differing thermal conductivities are necessary as in all thermal conductivity type vacuum gauges INSTALLATION The instrument is factory calibrated and ready for use when received All that is necessary to place the gauge in operation is to install the gauge tube into the system plug in the gauge tube cable and conne
5. OHS WLY wiv WLY iv WLY 0 00 oo 001 001 001 00 08 08 08 08 ag og OS 08 08 08 08 os 02 oz 0 02 oz 00 001 05 SS 09 01 Ol 01 02 9 5 O0 6 0i 05 6 S 4 S 9 6 S 5 6 8 pr 5 6 4 04 01 G 2 a 5 S 05 2 5 4 e 4 2 01 2 e e 2 8 2 2 e 2 2 e i 6 1 i i I 1 i i I I I i 8 i I o o o o o o o o o o o gt p P P gt HE EE 5 B s lt 8 304 2 m m m a m d o 2 a 9 n o z c gt lt a gt i z 9 m z m N 10 PAGE 5 9261 1equie 42 612 9 VSN u pajud 9N 38 SV9 IHL 804 40 SNOWOINW 38085384 3081 JHL JHL 40 3918 31150440 JHL NO 31vos 3ilvisdOHddV AHL 40 306 3H1 NO 9NIQV38 03AH3S80 319901 NVHL 1 0 SVD V NI 34156384 GNIS OL 3JAO08V NMOHS 535 9 538011 39099 001 JHL 350 HOIHA S39nV9 SONILSVH 40 9 5 WYY9OWON WLV WLY WLY WLY WLY ool ool 001 001 08 08 08 08 04 02 04 02 02 o 0 9 0 0 0 gt gt gt gt gt gt m 25 25 z a ES o gt D z Q 5 M m c 103A PAGE 6 3SVHd 9 c
6. ct the power cord to the AC line Gauge tubes should be installed with the open end pointing downward so as to be self draining dusty or dirty systems a Hastings particle drop out protective trap is recommended see Product Bulletin 352 OPERATION The gauge is in operation once connected to the gauge tube and power An initial check of the mechanical meter zero may be necessary upon receipt To do this unplug the power cord and set if necessary the meter mechanical zero adjustment the front of the meter to read the rear of the instrument are two calibration adjustments they should be correct as received An occasional check of the ATM adjustment may be desirable Also anytime a new gauge tube is replaced it is desirable to reset the ATM adjustment To do this expose the tube to atmospheric pressure after the gauge is fully warmed up about 30 minutes and adjust the trim potentiometer marked ATM until the needle reads ATM Use of a trim potentiometer tuning tool will facilitate this adjustment NOTE When turned off the meter needle rests at the right side of the meter ATM mark When no tube is plugged in the instrument reads off the scale below zero If a broken gauge tube is plugged in it will read off scale above ATM Replace with a new gauge tube The circuit has a protective shut down circuit This shuts down the electronics whenever a gauge tube is not plugged into the socket This is to prevent burning out
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