Sens SG-A1, User Manual

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SENS.413347.015RE
7
Cont. of table 3.2
Parameter name Value
-maximal resistance of closed contacts
0,8 Ohm
-maximal current leakage with 60 V voltage at opened terminals
4 µA
Time of gas detector continuous operation, without null and sensitivity
adjustments, at least
3 months
Self-test duration time after initial power-up, not more than 120 seconds
Protection degree as per GOST 14254 IP66
Mass, kg, not more than 3 kg
*when using CEHC interface, maximal power supply voltage is 18 V.
Metrological specification of gas detector is shown in table 3.3.
Table 3.3
Parameter name Value
Measurement range for the verification component (0...100) % of LFL
Time settling for output signal t(90), not more than 60 seconds
Limits of accepted main inaccuracy for measurements:
- absolute within measurement range from 0 to 60% of LFL,
% LFL, not more than
- relative within measurement range over 60 to 100% of LFL, %
LFL, not more than
±3
±5
Output signal variation (

), % LFL, not more than
±3
Limits for acceptable additional measurement inaccuracy in case
of temperature variation within ranges:
- (from minis 10 to plus 40)
°
С, % LFL, not more than
- (from minus 40 to minus 10)
°
C and (from plus 40 to plus 60)
°
C,
% LFL, not more than
±5
±10
Limits of acceptable additional measurement inaccuracy in case
of ambient air pressure variation within range from 80 to 120 kPa
and with pressure variation for each 3.3 kPa, LFL %, not more
than
±1.5
Limits of acceptable additional measurement inaccuracy in case of
ambient relative humidity variation within range from 0 to 98%,
LFL %, not more than
±5
at
temperature plus 40 °С and
relative humidity 50 %
3.11 Electrical insulation between all circuits of gas detector and housing must withstand
within 1 minute testing DC voltage with a nominal value of 500 V and frequency (50±5) Hz.
Electrical insulation shall withstand within 1 minute testing DC voltage with a nominal
value of 500 V and frequency (50±5) Hz between:
- circuits "A(D+)", "B(D-)" of RS-485 interface and other circuits of gas detector;
circuits "lout", "lin" of analogue current output and other circuits of gas detector;
circuits "R1", "R2" of each signal relay and other circuits of gas detector.