Technical Specification Notes - Chentronics iS3-MB Manual

TOLERANCE NOTES
FABRICATED TOLERANCES
≥ 2 ft (610 mm) ± 0.250 in (6.4 mm)
< 2ft (610 mm) ± 0.125 in (3.2 mm)
MACHINED TOLERANCES
± 0.050 DECIMAL DIM (1 PLACE)
± 0.010 DECIMAL DIM (2 PLACES)
± 0.005 DECIMAL DIM (3 PLACES)
Relay Contacts NOTE 3
Signal Output NOTES 4,5
FDORT (FLAME ON)
FDRT (FLAME OFF)
MFRRT
Safety Integrity Level
Data

Technical Specification NOTES

Purge air pressure is the minimum differential pressure required between the purge air supply
Note 1
pressure at "Y" (scanner connection) and the back pressure.
24 VDC Power supply to iScan3 must not include any inductive load.
Note 2
To achieve higher relay contact voltages, use iScan3 relay contacts to energize the coil of an
Note 3
interstitial relay.
Output for monitoring only. Not to be used to prove flame.
Note 4
4-20 mA outputs are calibrated at the factory to a known load. Monitoring hardware will have an
Note 5
impact of the current output. For accurate readings, 4-20 mA output(s) should be calibrated
using a milli-ammeter between the scanner's 4-20 mA output and the monitoring hardware.
Refer to the 4-20 ma Settings section MNL- iScan Software for details on how to execute the
calibration procedure.
SUGGESTED SIL3 PROOF TESTS:
Note 6
An annual proof test is good practice to meet the requirements in terms of IEC61508.
According to section 7.4.3.2.2 f of IEC61508 proof tests shall be undertaken to reveal
dangerous faults which may be undetected by diagnostics test.
Flame OFF: Shutdown the burner and ensure that the flame off condition is detected and
signaled by the flame detector as a flame off condition.
RELATED DOCUMENT – MUST COMPLY WITH SCHEDULE DOCUMENT(S):
FOR A LIST OF RELEVANT PATENTS
AND TRADEMARKS PLEASE SEE
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MNL-ISCAN3
Primary Relay with Normally Open and Normally Closed Voltage Free Contacts
contact closes when flame is detected, NC opens when flame is detected)
Secondary Relay with Voltage Free Contacts
(configurable as NO Flame Relay or Fault Relay configurable as NO or NC contacts)
0.125A @ 250 VAC Resistive Load
0.250A @ 125 VAC Resistive Load
1.0 A @ 24 VDC Resistive Load
Output #1, 4–20 mA, Flame Signal
Output # 2, 4-20 mA, Selectable as Gain or Internal Temperature
Maximum Current Loop Resistance = 750 ohms
Configurable from 1-4 seconds in 1 second increments
Configurable from 1-4 seconds in 1 second increments
Configurable from 1-6 seconds in 1 second increments
(SIL3) PFD = 938.369 X 10
AVG
λ = 1.14 X 10
SU
λ = 2.1705 X 10
DD
λ = 0.0219 X 10
DU
SFF = 99.1%
Proof Test Interval
time = 1 year (8760 Hrs)
ISCAN3 MANUAL
DCO No
.
12804
DWG. No.
-6
-6
-6
-6
NOTE 6
MNL-ISCAN3
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