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15. Specications
15.1 Specications
Environmental
Operational and Certied Temperature Range* - 40 °C to + 65 °C
Pressure Range 80 to 120 kPa (non-compensated)
Operating Humidity 0 to 99 %RH (non-condensing)
Storage Conditions for Searchpoint Optima Plus
and accessories
- 40 °C to + 65 °C, 80 to 120 kPa, 0 to 99 %RH (non-condensing)
Ingress Protection IP 66 / 67
* CU-TR Ex (Russia) Approval – XTC Version Certied Temperature Range -60 °C to + 65 °C
Performance
Repeatability < ± 2 %FSD at 50 %FSD
Linearity < ± 5 %FSD
Accuracy Baseline < ± 1 %FSD (Ethylene < ± 2 %FSD)
50 %FSD < ± 2 %FSD (Ethylene < ± 3 %FSD)
Long Term Stability (as dened in
EN 60079-29-1)
Baseline Methane 100 %LEL Range: ≤ ± 2 %FSD
Ethylene 100 %LEL Range: ≤ ± 4 %FSD
50 %FSD Methane 100 %LEL Range: ≤ ± 4 %FSD
Ethylene 100 %LEL Range: ≤ ± 5 %FSD
Drift Over Temperature Range (-40 °C to 65 °C)
Baseline ≤ ± 2 %FSD
50 %FSD Methane 100 %LEL Range: ≤ ± 0.131 %FSD per °C
Ethylene 100 %LEL Range: ≤ ± 0.078 %FSD per °C
Pressure Coefcient 1 % of reading per kPa
Response Time
Response Time
Complies with EN60079-29-1 (ATEX Performance Standard)
T50 < 3 seconds, T90 < 4 seconds (for methane, no accessories)
T50 = 6 seconds, T90 = 18 seconds (for methane, as supplied, tted
with Standard Weather Protection and Dust Filter)
Note:Forgascalibrationsotherthanthestandardhydrocarbongases(methane,ethane,propane,bu-
tane),theresponsetimemaybeslowerthanspecied.
Operation
Power Supply 18 to 32 Vdc (24 Vdc nominal)
Power Consumption < 5 W
Maximum 4-20 mA Loop Resistance 600 Ω
Minimum 4-20 mA Loop Resistance to main-
tain HART
®
communications
230 Ω
Retention of battery backed up data* 3 years unpowered
4-20 mA Output Refresh Rate 250 ms
Note:Incurrentsourcemode,forsupplyvoltagesof18to20Vdcthemaximumloopresistanceis
500 Ω.
* Searchpoint Optima Plus contains a backup battery which maintains the real time clock and event logs