Equipment Care and Maintenance

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Equipment Care and Maintenance
Oak Environmental Inc.

• Wesley Hutchen

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The Basics

• Overview Becoming familiar with equipment use
  and maintenance
• Troubleshooting
• Basic servicing

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Gastech 1238 ME

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Gastech 1238 ME

• Requires 5 minute warm up period
• Flow rate must be 2 5 CFH
• Needle must be zeroed

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Gastech 1238 ME

• Buttons must have free movement
• Calibration must be done weekly, or after a high
  concentration exposure
• Water filter must be used

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Diagnosing a Problem

• Check battery condition
• Check flow rate
• Check sensor chamber and hoses for leaks
• Inspect wiring
• Is the unit warmed up?

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Pump Servicing and Cleaning
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Pump Service and Cleaning

• Take note of where parts go!
• Use
• Diagrams
• Camera phone

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Pump Servicing

• Turn unit on, check for adequate suction at inlet

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Pump Servicing

• Remove retaining screw from bottom of unit

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Pump Servicing

• Remove retaining bracket

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Pump Servicing

• Remove pump assembly

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Pump Servicing

• Disconnect inlet hose from pump

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Pump Servicing

• Remove 4 pump head screws

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Pump Servicing

• Remove pump head

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Pump Servicing

• Remove and inspect pump o-rings, seals and valves
  

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Pump Servicing

• Remove 4 retaining screws from pump body

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Pump Servicing

• Carefully separate pump body from pump motor
  bracket

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Pump Servicing

• Remove screw and retainer from pump diaphragm

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Pump Servicing

• Remove diaphragm from pump body assembly

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Clean parts with distilled water
Pump Servicing
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Pump Servicing

• Check sensor hose for debris

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Remember!
Pump Servicing

• Check all parts for damage or wear!

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Pump Servicing

• Re-install pump diaphragm and retainer rib on
  diaphragm faces up

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Pump Servicing

• Center diaphragm and replace pump body

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Pump Servicing

• Pump marker should face towards motor assembly

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Pump Servicing

• Replace 4 retaining screws on pump body do not
  over tighten!

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Pump Servicing

• Replace o-rings and Teflon seals in correct
  sequence

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Pump Servicing

• Replace pump head and tighten 4 retaining screws
  do not over tighten!

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Pump Servicing

• Re-attach inlet hose to pump ensure correct
  orientation!

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Pump Servicing

• Re-install pump into Gastech

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Pump Servicing

• Re-install pump retaining bracket

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Pump Servicing

• Turn unit on and recheck suction

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Pump Servicing

• Allow unit to fully warm up before use

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Things to Check

• Is the sensor tight?
• Are there any broken wires?
• Are there any hoses kinked or disconnected?
• Is the water filter plugged?

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Questions?

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Calibration

• Gastech 1238 ME

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Gastech 1238 ME

• Typical Gas
• Hexane 400 PPM
• Hexane 40 LEL

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Gastech 1238 ME

• Circuit board Layout

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Gastech 1238 ME

• Find center position for zero knob
• Zero instrument in LEL mode using coarse zero
  potentiometer

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Gastech 1238 ME

• Measure flow rate using flow meter

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Gastech 1238 ME

• Apply gas at same flow rate or use a demand
  regulator
• Use humidifier!

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Gastech 1238 ME

• Adjust needle to match gas concentration on bottle

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Gastech 1238 ME

• Sensor span can be low in PPM mode apply LEL
  gas in FULL GAS MODE for 30 seconds. This can
  restore sensor span
• Sensor lead wires must be soldered to ensure a
  clean connection
• Use water trap filter and maintain cotton in probe

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Questions?

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RKI Eagle/Thermo Innova

• Introduction

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RKI Eagle/Thermo Innova

• Replacements for the Gastech 1238 ME

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RKI Eagle/Thermo Innova

• Benefits and Features
• LCD display
• Internal hydrophobic filter
• Low flow alarm
• User programmable alarm limits
• No potentiometers!
• Simple to use and calibrate

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RKI Eagle/Thermo Innova

• Operates in LEL or PPM mode
• Has methane elimination
• Uses standard D cell batteries

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RKI Eagle/Thermo Innova

• Has optional dilution fitting for low O2
  environments

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Questions?

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• Photo Ionization Detector
• (PID)

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PIDs

• MiniRae 2000/3000
• Photo Ionization detector

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Field Operation

• Requires 5 second warm up period
• Flow rate between .5 1 CFH
• Probe must not be obstructed
• Use humidity filter for headspace sampling

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Field Operation

• Warm up/self test sequence not to be interrupted
• Calibration must be done frequently
• Water filter must be used
• Moisture filter must be used for headspace
  sampling

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Diagnosing a Problem

• Check battery condition
• Check flow rate
• Check inlet probe for tightness
• Inspect filter
• Are gas settings correct?
• Inspect hoses and fittings

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• Servicing and Cleaning

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Servicing and Cleaning

• Remove inlet probe

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Servicing and Cleaning

• Check for suction with probe removed

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Servicing and Cleaning

• Unscrew cap, check filter and flame
• arrestor

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Other Problems

• Return unit to Oak Environmental for
• service

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Questions?

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Interface Meters

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Interface Meters

• Cleaning and Servicing

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Interface Meters

• Check battery
• Condition

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Interface Meters

• Inspect prism for
• damage

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Interface Meters

• Inspect tape for
• damage

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Interface Meters

• Cleaning

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Interface Meters

• Wipe tape assembly with towel and Alconox

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Interface Meters

• Carefully clean probe and prism

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Interface Meters

• Clean wiper assembly

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Other Problems

• Return to Oak Environmental for service

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Water Level Meters

• Check battery
• Check tape for damage
• Do not test in DI water
• May read sporadically in cascading water

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• pH/Conductivity Meters
• Care and Maintenance

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Questions?

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pH/Conductivity Meters

• pH probes are to be stored in solution
• Probes must not be frozen
• Clean with soft cloth or Q tip

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pH/Conductivity Meters

• Check battery
• condition

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pH/Conductivity Meters

• Inspect probes for
• damage

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pH/Conductivity Meters

• Inspect wiring for
• damage

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pH/Conductivity Meters

• Calibrate instrument according to
• manufacturers instructions

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Other Issues

• Dried out probe must be cleaned and calibrated
  before use
• Allow time to stabilize before calibration
• Return to Oak Environmental for further servicing

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DO Meters

• E7 error often means loose membrane
• Probe must be moving when sampling

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Questions?

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YSI Meters

• YSI 556

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The Basics

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YSI 556

• Multi parameter instrument which can measure
• pH
• Conductivity
• ORP
• DO
• Temperature
• TDS
• Salinity

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YSI 556

• Probe guard must be used

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YSI 556

• Stores data either in a snapshot or datalogs at
  user defined intervals

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YSI 556

• Simple to operate and calibrate

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YSI 556

• Servicing/Calibration

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YSI 556

• Typically a two point pH calibration is performed

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YSI 556

• Wait for readings to stabilize before confirming
  calibration

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YSI 556

• If parameters are too far off, instrument will
  ask you if you want to proceed
• Often required several times

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YSI 556

• Keep probe stored in either storage solution or
  distilled water

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YSI 556

• Check battery condition, and have spares!

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YSI 556

• Ideal instrument for low flow sampling

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Questions?

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• GT Series Gastech

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Diagnosing a Problem

• Check battery condition
• Check flow rate
• Fresh air zero instrument

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Diagnosing a Problem

• Error messages?
• Warmed up?
• Inspect hoses and fittings

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GT Series Gastech

• Calibrate according to manufacturers
• instructions

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Other Issues

• Return to Oak Environmental for servicing

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Questions?

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4 Gas Personal Monitors

• 4 Gas Personal Monitors

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Common Issues

• Batteries
• Calibration due
• Zero drifting

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Zero Procedure for BW Monitors

• Press and hold both bottom buttons
• (Fresh air atmosphere)
• Wait for unit to zero
• Check for cleared sensors

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Crowcon Tetra 3 Meters

• Follow same procedures for BW personal monitors

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Crowcon Tetra 3 Meters

• Zero is performed using one button
• Double click to access menu
• Single click to move cursor
• Double click to activate zero sequence

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• Remember!
• Properly maintaining equipment saves time and
  money!

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Questions?

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Equipment Quiz

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Question One

• Which of the following does a Photo Ionization
  Detector NOT detect?

• Perchlorethylene
• Diesel fuel
• Methanol

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Question One Answer

• C. Methanol (Trick question though. You can use
  an 11.7ev lamp, and it will!)

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Question Two

• Why must you use a water knockout filter when
  headspace sampling with a PID?

• The unit will rust
• Moisture will condense on the lamp, rendering the
  unit useless

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Question Two Answer

• B. Moisture will condense on the lamp

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Question Three

• What is the reason for using a Photo Ionization
  Detector for specific gases?

1. It automatically adjusts when it senses a gas
2. You can set a correction factor in the unit to
   give exact readings for specific compounds
3. It is prettier than a 1238 ME

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Question Three Answer
B. You can set a correction factor in the unit to
give exact readings for specific compounds
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Question Four

• You can turn off a GT series Gastech while there
  is a value remaining on the display for CO or
  Combustibles
• True or False?

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Question Four Answer

• False.
• When you turn the unit back on, you will see a
  negative reading due to the unit retaining a
  memory of the previous reading

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Question Five

• Which one of the following is true about a
  Gastech 1238 ME?

A. It calibrates using methane B. You can
switch between ME mode and full gas without
recalibrating C. It requires a five minute warm
up period
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Question Five Answer

• C. It requires a five minute warm up period

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Question Six

• What is ME referring to?

• Methane elimination
• Methane enabled

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Question Six Answer

• A. Methane elimination

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Question Seven

• Which part should you NOT use the gastech 1238 ME
  without?

1. The water filter
2. The cotton particulate filter in the probe
   assembly
3. The Dust cap which covers the charger plug
4. All of the above

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Question Seven Answer
D. All of the above
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Question Eight

• When should you charge the battery in a Gastech
  1238 ME?
• When the low battery alarm sounds
• Weekly
• Nightly

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Question Eight Answer

• C. Nightly

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Question Nine

• How often should a DO meter be calibrated?
• Weekly
• Daily
• After a change of membrane

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Question Nine Answer

• Both B and C.
• That way the unit can adjust for temperature,
  electrolyte changes, altitude and membrane
  contamination

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Question Ten

• When calibrating a Gastech 1238 ME, which one of
  the following is correct?
• Matching the gas flow rate to the flow of the
  pump
• Turning the course zero potentiometer on the
  motherboard to gain span
• Turning off the alarm during calibration

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Question Ten Answer

• A. Matching the gas flow rate to the flow of the
  pump

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Question Eleven

• Most conductivity meters have built in
  compensation for what parameter?
• Altitude
• Temperature
• Turbidity

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Question Eleven Answer

• Temperature

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Question Twelve

• RKI Eagles and Innova FV instruments calibrate
  using LEL gas only
• WHY?

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Question Twelve Answer

• PPM calibration is not accurate,
• nor stable in a digital instrument

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Question Thirteen

• YSI DO parameter should be calibrated in the
  sealed chamber it is stored in
• True or False?

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Question Thirteen Answer

• False.
• Atmospheric compensation will not be possible,
  and the calibration will not be accurate

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Question Fourteen

• You can test a depth sounder or interface probe
  by dipping the probe into distilled water
• True or false?

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Question Fourteen Answer

• False.
• You need conductivity in the sample to be able to
  activate the instrument

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Question Fifteen

• You can test an oxygen sensor by blowing on it
• True or False?

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Question Fifteen Answer

• True.
• The reading will drop dramatically just from your
  breath

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Gastech Reminders

• Calibrate frequently
• Check flow rate daily
• Report any problems or malfunctions immediately
• Have unit serviced quarterly by a certified
  technician

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Four Gas Monitor Reminders

• Zero unit at the beginning of the day
• Bump test daily
• Report any malfunctions
• Do not use unit if bump test fails

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pH/Conductivity Reminders

• Keep probes clean
• Do not allow probes
• to touch the ground

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Questions?

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• Email
• wesley_at_oakenviro.com
• sara_at_oakenviro.com
• frank_at_oakenviro.com
• terry_at_oakenviro.com

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• Website address
• www.oakenviro.com

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• Thank You!
• Oak Environmental Inc.