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27

space entry (29 CFR 1910.146) explicitly requires 
the use of direct reading, substance specific 
sensors whenever a particular toxic hazard is 
known to be likely to be present.  If hydrogen 
sulfide is known to be potentially present, one 
of the toxic sensors selected should be 
specifically for the detection of H

2

S, and 

calibrated directly to this hazard. 

The “CO Plus” sensor can be calibrated to either 
hydrogen sulfide or carbon monoxide.  In order to 
change the type of gas used to calibrate the “CO 
Plus” sensor, it is necessary to enter the 
“Configuration Setup” menu as discussed in Chapter 
4 and select the new calibration gas.   

Do not use multi-component 

calibration gas mixtures containing both carbon 
monoxide and hydrogen sulfide when 
calibrating a PhD Ultra with a CO Plus sensor 
installed.  Calibration of the CO Plus sensor 
with multi-component calibration gas mixtures 
containing both CO and H

2

S may lead to 

inaccurate and potentially dangerous readings. 

Biosystems multi-component calibration gas 
mixtures containing both carbon monoxide and 
hydrogen sulfide are labeled as “Not for use 
with CO Plus sensors”. 

Biosystems “CO Plus” sensors are designed for the 
simultaneous detection of both carbon monoxide 

and

 hydrogen sulfide.  “CO Plus” sensors may be 

calibrated to either carbon monoxide or hydrogen 
sulfide.  The calibration gas used to calibrate “CO 
Plus” sensors may contain only one or the other of 
these two gases.  Calibrating a “CO Plus” sensor 
with a gas mixture containing both carbon monoxide 
and hydrogen sulfide may produce dangerously low 
readings. 

Biosystems multi-component calibration gas 
mixtures that contain both carbon monoxide and 
hydrogen sulfide are labeled as “Not for use with CO 
Plus sensors”. 

  With the CO Plus sensor, the 

calibration gas setting determines whether the 
instrument is configured for the direct reading 
of CO, or for the direct reading of H

2

S.  

Calibration gas corresponding to the direct 
reading requirement must be used in the 
calibration of the instrument.  If carbon 
monoxide is chosen in the calibration gas 
setting option, the display will show CO+ and 
carbon monoxide must be used to verify 
accuracy.  Similarly, if hydrogen sulfide is 
chosen in the calibration gas setting option, the 
instrument will display H

2

S+ and hydrogen 

sulfide must be used to verify accuracy.  Use of 
the incorrect calibration gas may lead to 
inaccurate and potentially dangerous readings. 

If the sensor is calibrated to carbon monoxide the 
current gas reading display will identify a “CO+” 
sensor as currently installed and the PhD Ultra will
automatically use the alarm settings for carbon 
monoxide.  If hydrogen sulfide is chosen as the 
calibration gas the display will identify the sensor 
installed as an “H

2

S+” sensor and H

2

S alarm settings 

will automatically be used. 

3.1.2.1  Relative response of the “CO Plus” 

sensor to carbon monoxide and 
hydrogen sulfide 

A properly calibrated “CO Plus” sensor will respond
accurately to the gas to which it is calibrated.  
OSHA has assigned an 8-hour TWA of 35 PPM as 
the permissible exposure limit for carbon monoxide.  
If the “CO Plus” sensor is calibrated to carbon 
monoxide and then exposed to 35 PPM carbon 
monoxide, the reading will be 35 PPM.   

The “CO Plus” sensor will also show a “relative 
response” to other interfering gases.  When 
calibrated to carbon monoxide the relative response 
of the “CO Plus” sensor to hydrogen sulfide is a ratio 
of about 3.5 to 1.0.  This means a concentration of 
about 10 PPM hydrogen sulfide would produce a 
“CO+” sensor reading of 10 X 3.5 or 35 PPM.   

This is a very convenient relative response.  The 8-
hour TWA permissible exposure limit for hydrogen 
sulfide is 10 PPM.  This means that the “CO+” gas 
alarms will be tripped any time the concentration of 
hydrogen sulfide exceeds the permissible exposure 
limit. 

Note:  Cross sensitivity of the “CO Plus” sensor 
to carbon monoxide, hydrogen sulfide and other 
common interfering gases is listed in Appendix 
E. 

3.1.3  Choosing the correct calibration gas 

mixture 

The best results are obtained when calibration is 
done using the same gas that is expected to be 
encountered while actually using the instrument.   

Sensor performance, calibration gas strategies 
and “Propane Equivalent” calibration gas 
mixtures are discussed in greater detail in 
Appendix B.  A listing of currently available 
Biosystems calibration gas mixtures is 
contained in Appendix D. 

3.2 

Fresh air "zero" calibration 

The fresh air "zero" must be done in fresh, 
uncontaminated air.  In this procedure the 
instrument automatically adjusts its oxygen, 
combustible gas, and toxic gas readings to match 
the concentrations present in fresh air (20.9 percent 
O

2

, 0 percent LEL, 0 PPM toxic gas). 

Summary of Contents for PhD Ultra

Page 1: ...Reference Manual PhD Ultra Multi Gas Detector 651 South Main Street Middletown CT 06457 USA 860 344 1079 800 711 6776 FAX 860 344 1068 http www biosystems com Version 2 60 28JAN2008 Part Number 13 03...

Page 2: ...NS IT IS ESSENTIAL THAT THE INSTRUCTIONS IN THIS MANUAL BE READ FULLY UNDERSTOOD AND FOLLOWED AVERTISSEMENT LIRE ATTENTIVEMENT LES INSTRUCTIONS AVANT DE METTRE EN MARCHE PhD Ultra Operation Manual Ver...

Page 3: ...6 TEMPERATURE OUT OF RANGE 12 1 6 4 7 OTHER ELECTRONIC SAFEGUARDS 12 1 6 4 8 SECURITY BEEP 12 1 7 INSTRUMENT FIRMWARE REQUIREMENT FOR COMPATIBILITY WITH THE IQ SYSTEM 12 1 8 CLASSIFICATION FOR INTRIN...

Page 4: ...2 4 3 2 CHANGING SAMPLE PROBE TUBES 23 2 5 BIOSYSTEMS EEPROM EQUIPPED SMART SENSORS 24 2 5 1 Identification of type of sensor by instrument 24 2 5 2 Other information stored with the sensor EEPROM 24...

Page 5: ...38 4 4 RE INITIALIZING THE PHD ULTRA 38 4 5 RECORD KEEPING 39 4 5 1 PhD Ultra datalogging overview 39 4 5 2 Optional Datalink and Gas Detection Database Software Kit 39 4 5 3 Adjusting record keeping...

Page 6: ...IZED PUMP MAINTENANCE 49 5 4 1 Internal pump filter replacement 50 5 4 2 Specific problems with motorized pump 51 5 4 2 1 PUMP WILL NOT TURN ON 51 5 4 2 2 CAN T RESUME NORMAL OPERATION AFTER A LOW FLO...

Page 7: ...for combustible gas monitoring in atmospheres where oxygen concentrations exceed 21 0 oxygen ONLY THE COMBUSTIBLE GAS DETECTION PORTION OF THIS INSTRUMENT HAS BEEN ASSESSED FOR PERFORMANCE BY CSA UNIQ...

Page 8: ...An instrument that fails calibration may not be used until testing with known concentration test gas determines that accuracy has been restored and the instrument is once again fit for use 7 Do not r...

Page 9: ...ectrochemical toxic sensors that have been designed to minimize the effects of common interfering gases These sensors provide accurate dependable readings for toxic gases commonly encountered during c...

Page 10: ...c reading may indicate a hazardous combustible gas concentration that exceeds the PhD Ultra s zero to 100 percent LEL detection range Failure to immediately leave the area may result in serious injury...

Page 11: ...potentially life threatening atmospheric conditions Any alarm condition should be taken seriously The safest course of action is to immediately leave the affected area and return only after further te...

Page 12: ...nt firmware version is given immediately after the PhD Ultra is turned on 1 8 Classification for intrinsic safety The PhD Ultra is Classified by Underwriters Laboratories Inc and the Canadian Standard...

Page 13: ...nt is being used in a hazardous location Alkaline battery packs may not be opened and alkaline batteries may not be replaced while the battery pack is located in a hazardous area Battery replacement a...

Page 14: ...he padded leather weather cover 11 Key pad The key pad is located on the back of the PhD Ultra under the belt clip Slide the belt clip towards the rear of the instrument to access the four small push...

Page 15: ...ill then be shown Note If the date and time are incorrect see section 4 5 3 3 for instructions The PhD Ultra automatically evaluates itself to determine its electronic fitness for use by performing an...

Page 16: ...be put back into service or used until the accuracy of any affected sensor has been verified by exposure to the appropriate known concentration test gas The Needs Cal warning message may be acknowled...

Page 17: ...cal reading changes to reflect the new value the LED alarm light flashes and the audible alarm sounds PhD Ultra alarms are normally self resetting When readings drop below the pre set alarm levels vis...

Page 18: ...instrument keypad Push the and buttons at the same time to change operating modes Each time the operating mode is changed the display screen will briefly indicate the operating mode that has been sel...

Page 19: ...rinsic safety 2 3 3 Low battery alarms The PhD Ultra is designed to automatically determine which type of battery pack has been installed and use the appropriate low battery alarms Alarms will be acti...

Page 20: ...in and check to see that the PWR power on indicator LED on the charger cradle is lit 4 Slip the PhD Ultra into the charger cradle and check to see that the FAST fast charger indicator LED on the charg...

Page 21: ...ample draw adapter 3 Connect the other end of the hose to the sample probe as shown in Figure 2 4 1 1 4 Attach the sample draw adapter to the PhD Ultra as shown in Figure 2 4 1 2 5 Cover the end of th...

Page 22: ...4 2 1 Using the continuous sample draw pump 1 Turn the PhD Ultra on Figure 2 4 2 1 1 Sample draw pump and probe assembly 2 Connect the slip on battery operated pump with the hose and probe assembly as...

Page 23: ...taminants are removed by means of a cellulose filter similar to those used in filter cigarettes The hydrophobic filter includes a 0 1 Pm Teflon barrier which blocks the flow of moisture as well as any...

Page 24: ...henever a change is made during operation and whenever the instrument is turned off If a sensor is changed or replaced the PhD Ultra notes that a change has occurred displays a Needs Cal message the n...

Page 25: ...to inaccurate and potentially dangerous readings and may void the standard Biosystems warranty Customers are strongly urged to use only Biosystems calibration materials when calibrating the PhD Ultra...

Page 26: ...in serious injury or death Avertissement Toute lecture rapide et positive suivie d une baisse subite au erratique de la valeur peut indiquer une concentration de gaz hors gamme de d tection qui peut...

Page 27: ...instrument will display H2S and hydrogen sulfide must be used to verify accuracy Use of the incorrect calibration gas may lead to inaccurate and potentially dangerous readings If the sensor is calibr...

Page 28: ...d value during a bump test fails to fall between 100 and 120 of the expected value for the gas Always check the expiration date on calibration gas cylinder s prior to use Expired calibration gas can l...

Page 29: ...Calibration Adjustment screen This screen also includes a timer that counts down the number of seconds left to initiate the adjustment Note If the MODE button is pressed at any time prior to completi...

Page 30: ...en the instrument has detected that the proper gas has been applied the sensor will be adjusted 6 When all sensors currently installed have been successfully span adjusted the display will announce Au...

Page 31: ...ns Span calibration procedures using buttons on the instrument keypad are most useful when calibration of only a single sensor is desired Span calibration using the keypad buttons may only be done whi...

Page 32: ...gas is applied to the sensor being adjusted a screen will be displayed indicating that the span gas concentration is too low Verify that the flow rate of the regulator is 1 0 liters per minute Replac...

Page 33: ...tings can be restored at any time during normal operation by using the procedures discussed in Section 4 2 2 In many cases it is possible to comply with OSHA guidelines while using higher alarm points...

Page 34: ...reens would be shown Oxygen and combustible gas LEL The ceiling alarm set points for the toxic sensors currently installed The STEL and TWA alarm set points for the toxic sensor currently installed in...

Page 35: ...L button to advance the display to the next available setup option or press Mode to exit from the instrument setup screens 4 3 2 Changing the precision of the toxic sensor read out The toxic decimal p...

Page 36: ...age showing the minutes and seconds between beeps Use the and keys to set the interval Setting the interval to 0 will turn the security beep off 4 3 7 Low temperature alarms To access the low temperat...

Page 37: ...on Gas screen If an LEL combustible gas sensor has been installed the LEL sensor s calibration gas concentrations will be the first shown This screen indicates the concentration and type of test gas t...

Page 38: ...3 seconds A screen will briefly announce that changes have been made and the instrument setup has been updated The PhD Ultra will then turn itself off Pressing mode button to cancel the changes and s...

Page 39: ...ing data may be stored Datalogging is a transparent function that is continually in operation As long as the datalogger has not been disabled the instrument will begin recording data as soon as the in...

Page 40: ...o not effect the way in which TWA STEL Ceiling and Peak exposure values are calculated To modify the datalogger interval first enter the datalogging adjust mode as described in section 4 5 3 1 Once th...

Page 41: ...he software is set to the other proper communication will not be possible The software communication rate setting can be modified through the PC Setup screen as discussed in the PhD Ultra Datalink man...

Page 42: ...sion Press to view the oldest monitoring session in the datalogger memory After a few seconds the PhD Ultra will automatically show the most recent monitoring session The numbers in this screen signif...

Page 43: ...user ID is set press the mode button to display the list of locations currently in the instrument memory The first screen will show the current monitoring location on the top row with the name of the...

Page 44: ...be displayed whenever the instrument is first turned on Pressing the mode button acknowledges the message and allows normal operation The message will continue to be displayed each time the instrumen...

Page 45: ...e current status of the passcode option To disable the passcode option press the button To enable the passcode option press the button Press the CAL button to save the new setting Press the mode butto...

Page 46: ...lunt tool B4 Remove sensor blank from the sensor compartment Then proceed to step C5 or D5 depending on the sensor type For Sensors O2 LEL CO CO Plus H2S NO perform step C5 C5 Place the new filter sna...

Page 47: ...nt is connected to a 110 VAC power source through the battery charger The PhD Ultra must be located in a non hazardous location during the charging cycle Charging the PhD Ultra in a hazardous location...

Page 48: ...Technician operating mode Take the instrument to a non hazardous location If equipped with an alkaline battery pack replace the batteries and attempt to turn the instrument back on If equipped with a...

Page 49: ...en supplied with your replacement PROM Do not use small screwdrivers or other non recommended devices to remove the old PROM Use of non recommended devices can easily cause damage to the PROM socket C...

Page 50: ...sections of the pump case as shown in Figure 5 4 3 2 Remove the two pieces of tubing from the filter cap by gently twisting and pulling until the ends are free 3 Remove the filter cap and replace the...

Page 51: ...5 5 Returning your PhD Ultra to Biosystems for service or repair Please contact the Biosystems Service Department at 860 344 1079 to obtain a Return Authorization number prior to shipment A Biosystems...

Page 52: ...rt oxygen Although very high concentrations of carbon monoxide may be acutely toxic and lead to immediate respiratory arrest or death it is the long term physiological effects due to chronic exposure...

Page 53: ...to be present in LEL concentrations in order for this reaction to occur Even trace amounts of combustible gas present in the air surrounding the sensor will be catalytically burned on the surface of t...

Page 54: ...1910 146 OSHA has determined that a combustible hazard exists whenever the concentration of combustible gas or vapor exceeds 10 percent LEL Per this standard confined spaces with concentrations which...

Page 55: ...inst this potentially dangerous sort of calibration error Biosystems Propane Equivalent calibration mixtures are based on methane but in concentrations which are designed to produce a level of sensiti...

Page 56: ...ppm 1 0 ppm HCN 4 7 ppm 4 7 ppm 4 7 ppm NH3 25 ppm 25 ppm 35 ppm NO 25 ppm 25 ppm 25 ppm NO2 1 0 ppm 1 0 ppm 1 0 ppm Oxygen O2 Low alarm 19 5 High alarm 22 0 Combustible gas 10 LEL Biosystems PhD Ult...

Page 57: ...EZ Cal Value Pack multi component calibration gas CO 50 ppm propane equivalent 50 LEL in air Only for use with 54 12 022 Value Pack style fixed flow rate regulator 54 9041 EZ Cal multi component gas...

Page 58: ...s has with the sensor the effect can either decrease the signal negative cross sensitivity or increase the signal positive cross sensitivity Each figure represents the reaction of the sensor to 100 pp...

Page 59: ...closely follow these guidelines If your operating procedures do not permit daily checking of the sensors Biosystems recommends the following procedure to establish a safe and prudent accuracy check s...

Page 60: ...ears from date of purchase Toxi Limited 2 years after activation or 2 years after the Must Be Activated By date whichever comes first Toxi3Ltd 3 years after activation or 3 years after the Must Be Act...

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