BIL1-HY5000-O2Ogas analyzer is based on the paramagnetic
alternating pressure method and is used to measure oxygen in
gases. It is designed for use in non-potentially explosive
atmospheres.
2
for measuring ranges with free
parameter settings, also with zero offset,
all measuring ranges linear
potential free signal output
0 / 2 / 4 to 20 mA
autoranging or manual range switching
possible
storage of measured values possible
during adjustment
time constants selectable within broad
range
simple handling using menu based
operation
short response time design, characteristics
low long-term drift
two-stage access code
internal pressure sensor for correction
of pressure variations in sample
gas (range 0.5 bar to 2 bar absolute)
external pressure sensor may be
connected
automatic range calibration can be
parameters can be set
operation based on NAMUR recommendations
monitoring of sample gas and/or
reference gas (option)
RS 485 serial interface
several smallest spans (0,5 %, 2,0 %or 5,0 % O )
housing
19¡° unit with 4 HU for installation in hinged bays
19¡° unit with 4 HU for installation in cabinets, with or without
telescopic rails
front panel can be swung down for servicing
(laptop connection)
internal pressure sensor for correction of pressure variations in
sample gas
internal gas paths: FPM (Viton) hose or titanium piping
measuring chamber (with or without flow-type compensation
branch) made of stainless steel or tantalum for highly corrosive
sample gases (such as HCI, CI ,SO , SO etc.)
gas connections for sample gas inlet and outlet and for
reference gas: piping diameter 6 mm or 1/4¡°
2 2 3
display and control panel
large LCD panel for simultaneous display of:
- measured value (digital and analog display)
- status line
- measuring ranges
contrast of LCD panel adjustable using menu
permanent LED backlighting
cleanable membrane keyboard with five softkeys
menu based operation for settings, test functions and
calibration
user help in plain text
graphic display of concentration trend; adjustable time
intervals
inputs / outputs
six binary inputs freely configurable (e.g. range switching)
six relay outputs freely configurable (e.g. failure, maintenance
request, maintenance switch, limit alarm, external solenoid
valves)
two analog inputs configurable (e.g. correction of crossinterferences,
external pressure sensor)
optional extension with eight additional binary inputs and eight
additional relay outputs for automatic calibration with up to four
calibration gases
interfaces
RS 485 serial
Measuring range
Recommended
reference gases
Reference gases- preassure Remarks
Table reference gases
mode of operation
In contrast to almost all other gases, oxygen is paramagnetic.
This property is utilized as the measuring principle by the
BIL1-HY5000-O2 gas analysers.
Oxygen molecules in an inhomogeneous magnetic field are
drawn in the direction of increased field strength due to their
paramagnetism. When two gases with different oxygen concentrations
meet in a magnetic field, a pressure difference is
produced between them.
In the case of BIL1-HY5000-O2 , one gas (1) is a reference gas (N ,
O or air), the other is the sample gas (5). The reference gas is
led into the sample chamber (6) through two channels (3). One of
these reference gas streams meets the sample gas within the
area of the pulsating magnetic field (7).Because the two channels
are connected, the pressure, which is proportional to the oxygen
concentration, causes a flow between them.This flow is
converted into an electrical signal by a microflow sensor (4).
The microflow sensor consists of two nickel grids heated to
approx. 120 ¡ãC which form a Wheatstone bridge together with
two additional resistors. The pulsating flow results in a change in
the resistance of the Ni-grids. This leads to a bridge offset which
depends on the oxygen concentration in the sample gas.
Because the flow sensor is located in the reference gas stream,
the measurement is not influenced by thermal conductivity,
specific heat or internal friction of the sample gas. This also
provides a high corrosion resistance because the flow sensor is
not exposed to the sample gas.
By using a magnetic field with alternating strength (8), the effect
of a basic flow in the microflow sensor is not detected, and the
measurement is thus independent of the sample chamber´s
orientation.
The sample chamber is part of the sample path and has a small
volume. The microflow sensor thus responds quickly, resulting in
a very short response time for the BA 6000 - O .
Vibrations frequently occur at the place of measurement and may
falsify the measured signal (noise). A further microflow sensor
(10) through which no gas passes acts as a vibration sensor. Its
signal is connected to the measured signal as compensation.
If the density of the sample gas deviates by more than 50% from
the one of the reference gas, the compensation microflow sensor
(10) is flushed with reference gas just like the measuring sensor
(4).
2
2 2
2
2
1 reference gas inlet
2 restrictor
3 reference gas channel
4 microflow sensor for measurement
5 sample gas inlet
6 sample chamber
7 paramagnetic effect
8 electromagnet with alternating field strength
9 sample gas and reference gas outlet
10 microflow sensor in compensation system
(without flow)
technical data
measuring ranges 4, internally and
autoranging is also possible
Smallest possible 0,5% v/v, 2% v/v or 5% v/v O
largest possible 100% v/v O
measuring ranges with any zero point is possible between
suppressed zero 0 to 100% v/v as long as a suitable
calibration gas is used (see table)
characteristic linear (nature of technique)
control panel LCD with LED backlighting and
contrast control, softkeys, numeric
keypad and function keys
measured-value display 4½ -digit, resolution depends on
selected measuring range; selectable
number of digits following decimal
point
EMC according to NAMUR requirements
NE21 (05/93); CE designation
EN 50081 part 1, EN 50082: part 2
position of use front panel vertical
dimensions 19¡±, 4 HU = 177 x 483 x 476 mm
weight appr. 20 kg
mains connection AC 100 to 120 V, 48 to 63 Hz
(rated range: 90 V to 132 V)
AC 200 to 240 V, 48 to 63 Hz
(rated range: 180 V to 264 V)
appr. 35 VA
sample gas pressure 0,5 to 1,5 bar absolute for analysers
with hose, 0,5 to 3 bar absolute for
analysers with piping
sample gas flow 20 to 60 l/h (0,3 to 1 l/min.)
sample gas temp. 0 to 50 ¡ãC
sample gas humidity < 90% RH
warm-up time < 30 min at room temperature
display delay time min. 1,5 to 3,5 s depending on
(T time) version
damping 0 to 100 s setable
(electrical time constant)
dead time appr. 0,5 to 2,5 s depending
time for internal < 1 s
externally switchable;
on version
(purging time of gas path in analyser at
1 l/min.)
signal processing
measuring range
power supply
power consumption
gas inlet conditions
time response
2
2
(electromagnetic compatibility)
1)
2)
9 0
measuring response
3)
noise (electric time 0,5% of smallest possible
constant 1 s, range 2 ) span specified on type plate
zero drift < 0,5% / 3 months of smallest possible
measuring range according to rating
plate
drift of measured value < 0,5% / 3 months of respective
type plate
to
corresponding
deviation of
change
in
permissible
AC/DC 24V / 1A floating
(EN 60529)
measuring range
repeatability < 1% of respective measuring range
ambient temperature < 0,5% / 10 K
< 1% with span 0,5 % v/v O
referred to the smallest possible
measuring range acc. to
sample gas pressure without pressure compensation:
< 2% of measuring range with 1%
change in pressure.
with pressure compensation:
< 0,2% of measuring range with 1%
change in pressure
residual gases deviation of zero point due
paramagnetic or
diamagnetic residual gas
(see application note AD 55 0012)
sample gas flow < 1% of smallest possible measuring
range acc. to type plate with a
flow of 0,1 l/min. within the
flow range.
power supply < 0,1% of output signal span with
rated voltaged ¡À 10%
analog output 0/2/4 to 20 mA floating, load 750
relais outputs 6 changeover contacts, freely
selectable e.g. for range
identification:
analog inputs 2, designed for 0 / 2 / 4 to 20 mA
for external pressure sensor and
correction of influence of residual
gas (correction of cross-interference)
binary inputs 6, designed for 24V, floating,
freely selectable e.g. for range
switching
serial interface RS 485
options additional electronics with 8 binary
inputs and 8 binary outputs, e.g. for
triggering automtic calibration
permissible ambient -30 to +70 ¡ãC during storage and
transport
+5 to +45 ¡ãC during operation
permissible humidity < 90% RH as annual average during
storage and transport
degree of protection IP 20
RH: relative humidity
Maximum accuracy achieved after 2 hours
Referred to 1 bar sample gas pressure, 0,5 l/min. sample gas
flow and 25 ¡ãC ambient temperature
Keep above dew point
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