Sensepoint XCD Technical Manual SPXCDHMANEN Issue 15
6
Special conditions for safe use – Sensepoint XCD with
Flammable Sensor
1. Compliance with the Technical Manual is required for safe use of Sensepoint XCD.
2. The following environmental conditions of operation apply for the use of the
Sensepoint XCD:
Temperature: -20°C to +55°C
Relative humidity: 10 % to 90 %
Pressure: 80 kPa to 120 kPa
(extended range for humidity according to EN 60079-29-1)
3. In order to minimize measurement errors, the ambient conditions (temperature,
pressure, humidity) during the calibration of the measuring channels should be as close
as possible to those to be encountered during normal operation.
4. Measuring values from -8 % LEL to +5 % LEL are indicated as ‘0 % LEL’
(4 mA analogue output) in the measuring mode when deadband is on. When deadband is
off, the negative gas reading shall be indicated on display and mA output. Below -8 %LEL
is indicated as negative fault ‘F03’.
5. Measuring values beyond the end of the measuring range are indicated as
100 % LEL and alternately blinking ‘W04’ and ‘W05’. The analogue output is set to 22 mA.
6. Special states for Analogue output:
• ≤ 1 mA: System and other faults
• 2 mA: Start up, Inhibit
• 4 - 20 mA: Gas reading (when deadband is on)
• 2.4 - 20 mA: Gas reading (when deadband is off)
• 22 mA: Over range
7. If the Sensepoint XCD is operating in conjunction with a control unit to analyse the
measuring signal, only Analogue output (mA output) shall be considered as a safety
function and the control unit must operate correctly when the XCD transmits a value
outside of the measuring range.
8. If substances (e. g. sensor poisons) that could interfere with and affect the sensitivity of
the sensing device are to be expected in the atmosphere to be monitored which may cause
a rapid change of sensitivity, the calibration interval shall be reduced.
9. Before use, ensure that any alarm delay set is suitable for the intended application.
10. Some types and concentrations of dust in the measured atmosphere may impair the
measuring function of the gas detector.
11. Use only with the Weather Protection Cup accessory (P/N SPXCDWP). All accessories
are not the scope of EN 60079-29-1 performance approval.
12. The EC-Type examination certificate only applies to the measuring of Methane, Ethane
and Propane in air and up to the Lower Explosive Limit (LEL). Additional subtests of an
ATEX notified body are required for the measuring of other flammable gases, the results
being informed about as addition to this certificate.
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