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Instruction Manual                                                                                                                   WGM701 Wasp

 

 

InstruTech

 

Page 8 

 

2.3 

Electrical Conditions

 

 

 

  

WARNING!  

When high voltage is present in any vacuum system, a life threatening electrical shock hazard 

may exist unless all exposed electrical conductors are maintained at earth ground potential.  This applies to all 
products that come in contact with the gas contained in vacuum chambers.  An electrical discharge within a 
gaseous environment may couple dangerous high voltage directly to any ungrounded conductor of electricity.  A 
person could be seriously injured or killed by coming in contact with an exposed, ungrounded electrical 
conductor at high voltage potential.  This condition applies to all products that may come in contact with the gas 
inside the vacuum chamber (vacuum/pressure containment vessel). 

2.3.1

 

Proper Equipment Grounding 

 

  WARNING!  

Hazardous voltages that could seriously injure or cause death are present in many vacuum 

processes. Verify that the vacuum connection port on which the gauge is mounted is electrically grounded.  
Consult a qualified Electrician if you are in doubt about your equipment grounding.  Proper grounding of your 
equipment is essential for safety as well as intended operation of the equipment.   
 
The WGM701 must be electrically connected to the grounded vacuum chamber.  The connection must conform 
to the requirements of a protective connection according to EN 61010: 

 

VCR® connections fulfill this requirement. 

 

For gauges with a KF connection, use a conductive metallic clamping ring. 

 

  

WARNING!  In order to protect personnel from electric shock and bodily harm, shield all conductors 

which are subject to potential high voltage electrical discharges in or around the vacuum system. 

 

2.3.2

 

Electrical Interface and Control 

It is the user’s responsibility to ensure that the electrical signals from this product and any connections made to 

external devices, for example, relays and solenoids, are used in a safe manner.  Always double check the system 
set-up before using any signals to automate your process.  Perform a hazardous operation analysis of your 
system design and ensure safeguards and personnel safety measures are taken to prevent injury and property 
damage. 
 

2.4 

Overpressure and use with hazardous gases 

 

  

WARNING!  

Install suitable protective devices that will limit the level of pressure inside your vacuum 

chamber to less than what the vacuum chamber system components are capable of withstanding.  For example, 
a quick-connect, O-ring compression fitting may forcibly release a mounted device from the vacuum chamber 
fitting with only a few psi over local uncorrected barometric (atmospheric) pressure. 
 
In cases where an equipment failure could cause a hazardous condition, always implement fail-safe system 
operation.  For example, use a pressure relief device in an automatic backfill operation where a malfunction 
could result in high internal pressures if the pressure relief device was not installed on the chamber. 

Summary of Contents for Wasp WGM701

Page 1: ...h Cold Cathode Pirani Combination Vacuum Gauge WGM701 Module The Wasp User Manual InstruTech 1475 S Fordham St Longmont CO 80503 USA Phone 1 303 651 0551 Fax 1 303 678 1754 E mail info instrutechinc c...

Page 2: ...ility for any actual use based on the examples and diagrams No patent liability is assumed by InstruTech with respect to use of information circuits equipment or software described in this manual Thro...

Page 3: ...any form or by any means electronic or mechanical including photocopying and recording or by any information storage or retrieval system except as may be expressly permitted in writing by InstruTech P...

Page 4: ...Electrical Conditions 8 2 3 1 Proper Equipment Grounding 8 2 3 2 Electrical Interface and Control 8 2 4 Overpressure and use with hazardous gases 8 2 5 Gas Dependency 9 3 Installation 10 3 1 Mechanica...

Page 5: ...vice 19 7 1 Calibration 19 7 2 Maintenance 19 7 3 Contamination 19 7 4 Removing the gauge from service 20 7 4 1 Inspecting the sensor 21 7 4 2 Replacing the ionization chamber and sensor activation ai...

Page 6: ...WGM701 provides the basic signal conditioning required to turn the sensor into a complete vacuum pressure measurement instrument The built in controller provides a log linear analog output for the me...

Page 7: ...pply unit must be increased proportionally to the length of the cable fuse required 1AT supply voltage ripple 1 Vp p high voltage in measuring chamber operating voltage anode 3 3 KV sensor activation...

Page 8: ...02586 002585 Collector H High Current L Low Current Fittings Flanges C NW25KF D NW40KF F 2 3 4 in CF NW40CF Conflat Electrical Connector A 9 pin D sub male Example WGM701SHDA WGM701 with standard sens...

Page 9: ...emoved WARNING Do not modify this product or substitute any parts without authorization of qualified InstruTech service trained personnel Return the product to an InstruTech qualified service and repa...

Page 10: ...t the internal power supply and other components DO NOT operate the WGM701 with the WGM701 enclosure removed Contact with exposed electrical circuits in the WGM701 could result in death or serious inj...

Page 11: ...ding to EN 61010 VCR connections fulfill this requirement For gauges with a KF connection use a conductive metallic clamping ring WARNING In order to protect personnel from electric shock and bodily h...

Page 12: ...wed to increase above local uncorrected barometric pressure atmospheric pressure side vacuum fittings may release and possible overpressure conditions may cause leaks that would allow the gas inside t...

Page 13: ...the gauge with port down to help minimize the effect of any particles or condensation collecting in the gauge For electrical safety purposes the housing of the gauge must be grounded to the vacuum cha...

Page 14: ...KF flanges metal clamps must be used to ensure proper grounding WARNING The gauge may only be connected to power supplies instruments or control devices that conform to the requirements of a grounded...

Page 15: ...D 3 Analog output Log Linear 0 5 to 7 Vdc 0 5 V decade 4 Power Input 14 5 to 30 Vdc 2 W protected against power reversal and transient over voltages 5 Not assigned 6 Do not connect 7 Analog output com...

Page 16: ...le The two sensors are designed to operate as one combined measuring unit The optimum measuring configuration for the particular pressure range in which measurement is performed is shown below 7 6 x 1...

Page 17: ...off EEPROM error 4 4 Gauge Adjustment The cold cathode measuring circuit which is dominant for low pressures 7 6 10 4 Torr is factory calibrated and cannot be adjusted The HV zero adjustment of the P...

Page 18: ...If the output from the gauge corresponds to 760 Torr the ATM adjustment has been successful Otherwise repeat the adjustment procedure 4 4 2 Pirani HV zero adjustment For adjusting the zero operate the...

Page 19: ...N2 For other gases the measurements have to be corrected Indicated pressure range from 7 6 x 10 3 to 75 Torr Pirani Mode only Gauge calibrated for air p Torr peff Torr 102 8 6 4 2 101 8 6 4 2 100 8 6...

Page 20: ...indication is linear For gases other than air the pressure can be determined by means of the following conversion formula peff K indicated pressure where Gas type K Air N2 O2 CO 1 0 Xe 0 4 Kr 0 5 Ar...

Page 21: ...tage is 10 Vdc when pressure is in the cold cathode measurement but the cold cathode sensor has not ignited Log Linear Analog Output N2 air only Pressure Torr Voltage 1 0E 09 1 0 1 0E 08 1 5 1 0E 07 2...

Page 22: ...ation in the range of 7 6 x 10 5 to 7 6 x 10 3 Torr can cause severe contamination as well as reduced up time Contamination can to a certain extent be reduced by Geometric protection e g screenings el...

Page 23: ...CAUTION Dirt and damage impair the function of the vacuum component Take appropriate measures to ensure cleanliness and prevent damage Touching the product or parts with bare hands increases the desor...

Page 24: ...the retaining ring 1 as well as the ionization chamber 2 from the measuring chamber 3 Check the ionization chamber and the measuring chamber for contamination Ionization chamber is contaminated only...

Page 25: ...ool We recommend to rub the inside walls of the measuring chamber up to the groove for the retaining ring to a bright finish using a polishing cloth CAUTION The sealing surfaces must only be worked co...

Page 26: ...cal stop is reached and mount the retaining ring 1 It is recommend to perform a leak test leak rate 1 10 9 mbar l s Carefully slide the measuring chamber 3 clean or new into the electronics unit 5 unt...

Page 27: ...ics unit 5 until the mechanical stop is reached Pins aligned straight 3 5 4 Fasten the measuring chamber 3 by means of the hexagon socket set screw 4 Perform an ATM and HV adjustment of the Pirani usi...

Page 28: ...put does not drop under below 10 V lid solid green blinking green off Gas discharge has not ignited Wait until the gas discharge has ignited 5 minutes at a pressure of 7 6 X 10 10 Torr Signal output c...

Page 29: ...Alteration or removal of serial numbers or other identification marks renders this warranty void The warranty does not apply to products or components which have been abused altered operated outside...

Page 30: ...p n 002618 100 InstruTech 1475 S Fordham St Longmont CO 80503 USA Phone 1 303 651 0551 Fax 1 303 678 1754 E mail info instrutechinc com www instrutechinc com...

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