4.1
INSTRUCTIONS
Volumetric IR Process Gas Monitor
PIRVOL Series
APPLICATION
PIRVOL Infrared Process Gas Monitors provide
continuous measurement of hydrocarbon vapors in the
range of 0 to 90% by volume. The PIRVOL-LT model
provides an analog 4 to 20 milliampere signal output
that is proportional to methane vapor concentrations
from 0 to 90% by volume, while the PIRVOL-VR model
provides an analog 4 to 20 milliampere signal that is
proportional to propane from 0 to 90% by volume.
All PIRVOLs are designed for use in extractive vapor
sampling systems where the vapor concentration is
likely to be above the lower flammability limit (LFL).
Typical applications for PIRVOL-LT include natural
gas and oil well mudlogging, or coalbed methane
collection systems. In both cases, methane-laden
vapor samples are extracted from a tank or process
area and analyzed by PIRVOL-LT to determine the
methane concentration level. Typical applications
for the PIRVOL-VR include gasoline transfer vapor
recovery systems, where the vapor recovery processor
or vent is monitored for efficient vapor recovery and
control.
All PIRVOL models are 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 in the presence of high concentrations
or constant background levels of hydrocarbons and
in oxygen depleted atmospheres.
• There are no known poisons, e.g. silicones or
hydrides, that compromise the integrity of the
measurement.
SPECIFICATIONS
INPUT VOLTAGE—
24 vdc nominal. Operating range is 18 to 32 vdc
including ripple.
POWER CONSUMPTION (Watts)—
Input Voltage:
18 vdc
24 vdc
32 vdc
Nominal
3.5
4.6
6.2
Maximum
4.0
5.5
7.0
DETECTION RANGE—
PIRVOL-LT: 0 to 90% by volume methane.
PIRVOL-VR: 0 to 90% by volume propane.
DETECTABLE GASES—
PIRVOL-LT is intended for methane monitoring only,
PIRVOL-VR for propane only. PIRVOL responds
to most hydrocarbon gases, however, the signal
processing program is only accurate for the target
gas.
CURRENT OUTPUT—
Linear 4 to 23 ma current source (non-isolated).
Output levels below 2.4 ma indicate calibration, fault
and fouled optics conditions.
4.1
©Detector Electronics Corporation 2007
7/07
95-8522
