APPENDIX A - SPECIFICATIONS
Default settings A1 A2 Fault
Default coil state de-energised de-energised energised
Default latch state non-latching non-latching non-latching
Default terminal normally open normally open normally open
DigitalI/Ostandards: Optional.LonWorks
Display: LCD.
Informationdisplayed:
gas reading, state (OK, fault, inhibit, warning, A1, A2, Overrange),
fault/warning codes,
CertiedSensortypeanddiagnosticdata.
Displaylanguage: Defaultlanguage:English.
The user can select German.
Keypad/userI/O: Fourkeys(escape,up,down,ok)forcalibration,conguration,relay
de-latching,displayofstatusinformation,acceptanceofnewCertied
Sensor types, basic testing of output functions (digital bus test,
4-20mAtest).
4-20mAoutput: 3-wiresinkorsource,4-wire,isolated.Range0-22mA.Zeropoint
adjustableintherange4mA±0.5mA(default4mA).Uppercurrent
limitedto22mA.Loopresistance0-300ohms(witha24Vloopsupply).
Fault: 0mAnominal(0-0.5mA)
Inhibit: 1mAdefault(usercongurable1-4mA)
Warning: Userselectable.Eitheraxedlevel(3mAdefault,usercongurable
between 1-4mA), a pulsed current or disabled.
When the unit is in the warning state a gas reading can still be
calculated.
Ifthevalueofthisincreasesbeyond50%oftherstalarmlevelthe
4-20mAoutputrevertstoindicatingthegasreading.
Ifsubsequentlythereadingdecreasesbelow25%oftherstalarm
levelthe4-20mArevertstoindicatingthewarningstate.
OverRange: 21mA
Caution:WhencompliancewiththeATEXperformancestandardis
required the warning and inhibit current shall not be
conguredtoavaluebetweenthan3.1mAand4.9mA.
Note:ForOxygensensors,theoutputisarrangedsothat4mA
correspondsto0%V/V,and20mAcorrespondsto25%V/V.
Theoverrangestatecanbeconguredaseitherlatchingor
non-latching. The default is non-latching.
Terminalsizes: Fieldwiringterminalsaccept2.5mm
2
conductors.