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Mounting Template
100 mm
(2.54 in.)
Ø 12.70 mm
(0.50 in.)
130 mm
Clearance needed below Midas for tubing and cables.
43.5 mm
(1.71 in.)
22.2 mm
58.5 mm
(2.303 in.)
Power Consumption:
Transmitter unit
Transmitter with pyrolyzer (std or HTP)
Transmitter with LonWorks Module
Transmitter with LonWorks and pyrolyzer
Wiring Notes:
i)
Maximum wire size is 1.5 mm (16AWG)
ii)
Input voltage range is 21.6 to 26.4 VDC.
iii)
It is mechanically possible to misalign Plug 1 and Plug 2. Care should be taken when
inserting plug to assure correct alignment.
iv)
Plug 1 and Plug 2 are internally connected in parallel to facilitate wiring in bus topology.
v)
LonWorks FT-10 wiring is polarity-insensitive. Lon A and Lon B may be swapped.
Note:
The Midas
LonWorks
®
External equipment should be sized appropriately. Additionally, the Midas
to rise to the minimum specification (21.6 VDC) within 500mS.
Wiring Diagram
Pwr Common
Pwr +24 VDC
Lon A
Lon B
Pwr Common
Pwr +24 VDC
Lon A
Lon B
nv1
< 5 W
< 12.95 W
< 8 W
cp22
< 15.95 W
cp24
interface draws approx 1.7 amps for approx 100 mS after power is applied.
®
LonMark Object Diagram
See Tech Note 1998-0643 for details.
MIDAS LonWorks Device
Open-loop sensor Functional Block
nvoConc
nv1
SNVT_ppm_f
Mandatory
Implementation-Specific
nviRelay1
nvoAlm2
SNVT_lev_disc
SNVT_lev_disc
nviRelay2
nvoAlmL
SNVT_lev_disc
SNVT_lev_disc
nviRelay3
nvoAlmS
SNVT_lev_disc
SNVT_switch
nviReset
nvoAlmThresh1
SNVT_lev_disc
SNVT_ppm_f
nvoAlmThresh2
SNVT_ppm_f
nvoCellLife
SNVT_elapsed_tm
nvoFaultD
SNVT_lev_disc
nvoFaultS
SNVT_switch
nvoGasSelection
SNVT_count
nvoMonState
SNVT_state
nvoNstat
SNVT_state
Node Object Functional Block
nviRequest
nvoStatus
nv2
SNVT_obj_request
SNVT_obj_status
Mandatory
Implementation-Specific
nvoChkSum
nv3
SNVT_count
Virtual Function Block
nciMaxSendT
SNVT_elapsed_tm
nciMinSendT
SNVT_elapsed_tm
requires the supplied power
®
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