Dräger PIR 7000 Technical Handbook

57
Maintenance
Zero-Point Calibration Dräger PIR 7000 / Dräger PIR 7200
Action Status Indicator Output Signal Meaning Timeout
Prepare the device for zero-point calibration:
Place the magnetic
wand onto the mark
» 0 «.
Green/yellow flash
alternately and
quickly.
Measuring mode Unlock device for zero-
point calibration.
Remove the magne-
tic wand.
Green and yellow
are on.
Measuring mode Device waits for the start
of calibration. 4 minutes
Initiate the zero-point calibration:
Place the magnetic
wand within 2
seconds onto the
mark » 0 « for at least
1 second and then
remove it.
Green/yellow flash
alternately.
Maintenance
signal
The calibration routine is
started.
Place on calibration
adapter Dräger
PIR 7000.
Feed nitrogen or syn-
thetic air with at least
0.5 L/min onto the
sensor.
Make sure that the
gas transmitter was
entirely purged with
the chosen zero gas.
≈30 minutes
Put magnetic wand
onto the mark » 0 «,
then remove again.
Green and yellow
are on.
Maintenance
signal
Confirmation that the gas
transmitter was purged
with the chosen zero gas.
Green/yellow flash
alternately and
slowly.
Maintenance
signal
The device determines the
current zero-point devia-
tion.
Display of the zero-point deviation: Deviation from 0.0 %LEL
or 0.00 % vol. CO
2
:
Green flashes at a
single rhythm.
Maintenance
signal
≤1.5 %LEL resp.
≤0.013 % vol. CO
2
(configurable)
Green flashes at a
double rhythm.
Maintenance
signal
>1.5 %LEL to ≤3 %LEL
resp. >0.013 % vol. CO
2
to ≤0.03 % vol. CO
2
Green flashes at a
triple rhythm.
Maintenance
signal
>3 %LEL resp.
>0.03 % vol. CO
2
≈30 minutes

Dräger PIR 7000 Specifications

General

Detection Principle	Infrared (IR)
Pressure Range	700 to 1300 hPa
Ingress Protection	IP66/67
Gases Detected	Hydrocarbons
Measurement Range	0 - 100 %LEL (Lower Explosive Limit) or 0 - 100 vol.%
Operating Temperature	-40 to +65 °C
Output Signal	4-20 mA
Housing Material	Stainless steel
Certifications	ATEX, IECEx, UL, CSA
Response Time	t90 ≤ 4 s