DG-9E/4 detector INSTRUCTION MANUAL edition 1U5©gazex’2013v1301 3 / 9
2. TECHNICAL PARAMETERS TABLE 2.1.
Supply voltage 9VDC= ( permitted fluctuations 6,0 ÷ 15,0V)
Current consumption typical 35mA, max 50mA
Operation temperature recommended 5C to +40C (thermal compensation range)
permitted 0C to +45C (outside compensation range);
at air humidity between 5% and 95% (without moisture condensation
on sensor )
Storage temperature optimum from +5C to +25C ;
permitted from -15C to +50C
Detected gases oxygen, range 1 ÷ 25% vol. (theoretical – up 100%)
Gas sensor electrochemical, with thermal compensation,recommended calibration
period = 6 months; operation life 4 years = ca. 900.000 [O2% x h]
in regular conditions
Measurement method diffuse
response time t90 = below 15 sec.
Resistance to gases
and disturbing factors
no effect: CO, CO2, NOX, methane, H2S, H2, argon,
air movement - no effect;
small effect (negligible at NDSCh levels): Cl2, CFCs, SO2, NH3, HCl
Disturbing factors isopropyl alcohol, hexane, CCl4
absolutely avoid: NaOH;
due to sensor’s structure: acetone and methyl ethyl ketone
Effect of atmospheric pressure. proportional (linearity 2% in range 0,5 - 1,5 atm.)
Effect of moisture (at const
ant temp and concentration)< 1% of concentration level, in temp. range . <+25C, ca 21% O2;
< 3% of concentration level, temp. range . +25C to +40C,ca 21% O2
Alarm thresholds two, in range 17 ÷ 25% v/v
Threshold concentration
levels - typical ALARM 1 = 19 % v/v
ALARM 2 = 18 % v/v; (or in above range);
exact setting see calibration certificate SSW enclosed
to each DG-9E/4 )
Calibration conditions
20,9% v/v O2, 20(2)C, RH 65(±10)%, atmospheric pressure
1013(±30)hPa, >72h continuous power supply
Alarm threshold
setting accuracy 5% of threshold level, at calibration each 6 months (internal button)
Alarm threshold 5% of concentration level (within temp.range from +5C to +40C)
stability 10 % of concentration level - long-term within 3 years
Recalibration possible local calibration (20,9%), without calibration mixture;
calibration button + LED control lamp + potentiometer as standard
equipment
Alarm signal
outputs two, transistor type OC (<20VDC=, < 50mA),
independent for each threshold; with direct connection to
MD unit possibility
Electronic systems constructed by SMD, technology, incorporated power supply and
wire connection effectiveness control system
Dimensions, weight 185 x 110 x 55 mm H x W x D (with cable gland); ca. 0,4kg
Housing ABS/PC, IP54
CAUTION:
The oxygen sensor is an integral element, in chlorinated polyvinyl chloride (CPVC) housing.
It is filled with electrolyte with weak acid reaction and includes also small amounts of lead
and its compounds, and gold. In case of mechanical damage of sensor and contact with electrolyte
the exposed area shall be flushed with plenty of water and possibly obtain the medical advice.
The applicable regulations must be observed for utilization.
