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4.1

6

95-8522

Normal

In the normal operating mode, the 4 to 20 milliampere 
signal  level  corresponds  to  the  detected  gas 
concentration.    The  PIRVOL  continuously  checks 
for  system  faults  or  initiation  of  calibration,  and 
automatically changes to the appropriate mode.

Fault

Faults  detected  during  warmup,  normal  operation,  or 
calibration are indicated by the current loop output as 
shown in Table 1.

Calibration

The  PIRVOL-LT  is  calibrated  at  the  factory  for 
detection  of  methane.    PIRVOL-VR  is  calibrated  for 
propane.  No field calibration is required under normal 
circumstances.

In  the  event  the  PIRVOL  optics  are  fouled  and 
complete optics disassembly for cleaning is required, 
device re-zeroing may be required after re-assembly.  
Refer to the “Calibration” section for details.

NOTE

A  momentary  connection  of  the  calibration  lead 
wire  to  DC  negative  (common)  of  the  power 
supply  initiates  the  zero  and  span  calibration 
sequence.    When  wiring  the  PIRVOL,  use  care 
to  isolate  it  from  accidental  contact  with  the 
junction box and/or other conductors.

INSTALLATION

DEVICE MOUNTING ORIENTaTION

It is highly recommended that the PIRVOL be installed 
in the horizontal position.  See Figure 5.

JUNCTION BOxES

The PIRVOL is designed to be threaded into a junction 
box,  which  is  then  mounted  to  a  solid,  vibration-free 
wall or post.

Det-Tronics  offers  two  junction  box  styles  for  use 
specifically with the PIRVOL:

• Tall  Cover  Model  (junction  box  cover  includes  a 

window).  See Figure 6.

• Short  Cover  Model  (junction  box  uses  solid  cover).  

This  junction  box  can  also  be  used  for  detector 
separation.  See Figure 7.

GENERaL WIRING REqUIREMENTS

NOTE

The  wiring  procedures  in  this  manual  are 
intended  to  ensure  proper  functioning  of  the 
device  under  normal  conditions.    However, 
because  of  the  many  variations  in  wiring 
codes  and  regulations,  total  compliance  to 
these  ordinances  cannot  be  guaranteed.    Be 
certain  that  all  wiring  complies  with  applicable 
regulations relating to the installation of electrical 
equipment  in  a  hazardous  area.    If  in  doubt, 
consult  the  authority  having  jurisdiction  before 
wiring the system.

The  use  of  shielded  cable  in  conduit  or  shielded 
armored cable is recommended for optimum RFI/EMI 
protection.    In  applications  where  the  wiring  cable 
is  installed  in  conduit,  the  conduit  must  not  be  used 
for  wiring  to  other  electrical  equipment.    To  assure 
proper  operation,  the  resistance  of  the  connecting 
wire must be within the specified limits.  The maximum 
distance  between  the  PIRVOL  and  power  source  is 
determined  by  the  power  supply  capability  and  wire 
size.  See Figure 2 to determine the proper wire size 
and maximum wiring distance allowed.

It is important that moisture not be allowed to come in 
contact with the electrical connections of the system.

The  use  of  proper  piping  techniques,  breathers, 
glands,  and  seals  are  required  to  prevent  water 
ingress and/or maintain the explosion-proof rating.

CORRECT

INCORRECT

Figure 5—Recommended Orientation of PIRVOL Detector

Summary of Contents for DET-TRONICS 95-8522

Page 1: ...Instructions 95 8522 Volumetric IR Process Gas Monitor PIRVOL Series 4 1 7 07 95 8522 ...

Page 2: ...ay Device 5 Operating Modes 5 Installation 6 Device Mounting Orientation 6 Junction Boxes 6 General Wiring Requirements 6 Wiring Procedure 7 Detector Separation Optional 8 Startup Procedure 9 troubleshooting 9 Maintenance 9 Disassembly and Cleaning Procedure 10 Calibration 11 Device Repair and Return 12 Ordering Information 13 ...

Page 3: ...e CSA certified for use in Class I Division 1 Groups B C and D and Class I Division 2 Groups A B C and D areas They are fitted with a sealed sampling cup with compression type 0 25 inch o d tubing fittings for easy integration into a vapor sample extraction system FEATURES Routine calibration not required Continuous self test automatically indicates a fault or fouled optics condition Performs well...

Page 4: ...hane calibrated PIRVOL LT 95 8522 Figure 1 4 to 20 ma Current Loop Resistance Table 1 Current Loop Output Levels and Corresponding Status Indications Current Level Status 23 0 ma 100 by volume 20 0 ma 90 by volume 4 0 ma Zero gas level 0 by volume 2 2 ma Zero calibration in progress 2 0 ma Span calibration in progress 1 8 ma Calibration complete remove gas 1 6 ma Calibration fault 1 0 ma Fouled op...

Page 5: ...h 5 watt walkie talkie keyed at 1 meter ENCLOSURE MATERIALS Copper free aluminum clear anodized enclosure Stainless Steel 316 electropolished enclosure SAMPLE DRAW CUP Material Aluminum Fittings Brass Tubing Size 1 4 inch O D MOUNTING Det Tronics junction box available in a tall cover with window or a short cover version is recommended for optimum ease of installation PIRVOL can be threaded into a...

Page 6: ...s designated reference and the other active with different optical filters in front of the two sensors to make them selective to different infrared wavelengths The reference wavelength is unaffected by combustible gases while the active wavelength is absorbed by combustible gases The ratio of the active to the reference wavelength is computed within the PIRVOL to determine the concentration of gas...

Page 7: ...PIRVOL it enters a Warmup mode for approximately one minute in which it performs diagnostic checks and allows the sensors to stabilize before beginning normal operation The current output during this period is 0 milliamperes At the end of the warmup period with no faults present the PIRVOL automatically enters the Normal operating mode If a fault is present after the warmup the current output will...

Page 8: ...th the PIRVOL Tall Cover Model junction box cover includes a window See Figure 6 Short Cover Model junction box uses solid cover This junction box can also be used for detector separation See Figure 7 General Wiring Requirements NOTE The wiring procedures in this manual are intended to ensure proper functioning of the device under normal conditions However because of the many variations in wiring ...

Page 9: ... 4 to 20 ma signal output Yellow lead Calibration input Green lead Chassis ground If the calibration wire yellow lead is not being used do not connect this wire to ground Trim excess length and insulate wire so no shorting can occur 95 8522 Figure 6 Tall PIRVOL Junction Box with Window Figure 7 Short PIRVOL Junction Box Figure 9 Typical PIRVOL Wiring with Det Tronics Junction Box DET TRONICS JUNCT...

Page 10: ... the transmitter and then to the PIRVOL to ensure that the power requirements are met Mounting and Connecting Procedure for Detector Separation The PIRVOL junction box can be mounted to a wall or post or it can be suspended by the conduit if this does not result in excessive vibration The junction box should be electrically connected to earth ground 1 Lubricate the sensor threads with low vapor pr...

Page 11: ...ng threads on the PIRVOL and associated junction box A suitable grease is listed under Spare Parts in the Ordering Information section of this manual It is recommended to keep spare IR modules See Spare Parts section for field replacement in the event of a malfunction 95 8522 Current Level Status Corrective Action 2 4 to 3 9 ma Negative Zero Indication NOTE This fault can be caused by the presence...

Page 12: ...up from the front of the PIRVOL See Figure 12 2 Perform a visual inspection of the sample draw cup and associated plumbing and clean as required Also inspect the two O rings inside the sample draw cup and clean lubricate or replace as required 3 Loosen the two captive screws on top of the mirror assembly Figure 12 and remove the mirror assembly and hydrophobic screen from the electronics assembly ...

Page 13: ...rocured Calibration Procedure To perform a zero calibration of the PIRVOL follow the sequence described in Table 3 NOTE The calibration sequence is initiated by momentarily connecting the calibration lead to the negative lead common of the power supply using either the Cal Magnet or an external switch If the Det Tronics junction box with magnetic Cal Switch is being used this is accomplished by ho...

Page 14: ... packing material in addition to an anti static bag or aluminum backed cardboard as protection from electrostatic discharge Return all equipment transportation prepaid to the factory in Minneapolis Description Current LED Operator Action Normal operation no gas present 4 0 ma Off If the possibility of background gases exists purge the sensor with clean air to ensure accurate calibration Initiate c...

Page 15: ...7128 001 Sample Draw Cup with O Rings and Fittings 007128 002 O Ring Kit UL 006297 003 Hydrophobic Screen 006680 001 Silicone Grease Assistance For assistance in ordering a system to meet the needs of a specific application contact Detector Electronics Corporation 6901 West 110th Street Minneapolis Minnesota 55438 USA Operator 952 941 5665 or 800 765 FIRE Customer Service 952 946 6491 Fax 952 829 ...

Page 16: ... IR Combustible Gas Detector Eagle Quantum Premier Safety System Eagle Logic Solver Safety System Det Tronics the DET TRONICS logo Eagle Quantum Premier and Eclipse are registered trademarks or trademarks of Detector Electronics Corporation in the United States other countries or both Other company product or service names may be trademarks or service marks of others Copyright Detector Electronics...

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