Boiler house TDS blowdown controls
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Requirements Many countries ensure the protection and safe operation of boiler equipment, buildings and personnel through Legislation and Standards. For example shell boilers operated in the European Community must comply with requirements of the harmonised standard EN 12953 that specifies maximum contamination levels for boilers operated unsupervised for periods of 24 or 72 hours.
Function To protect the boiler feedwater system from oil and grease contamination, the Turbidity Monitoring System has two independent alarm set points: - Alarm 1 can be set to divert and discharge contaminated water above 3.0 ppm to a blowdown vessel or directly to drain. - Alarm 2 can be set to shut down the boiler if contamination level rises above 5.0 ppm. Diversion of contaminated supplies may be achieved with two 2-port ball valves with a ¼ turn actuator or a 3-port actuated valve.
Spare parts For available spares and options please contact your local Spirax Sarco representative.
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Technical data TF56-N Turbidimeter Material
Sensor body stainless steel 316 Ti, 1.4571
Line size
DN25
Process connection
DIN flange (EN 1092)
Gaskets
Viton seals
Windows
Sapphire
Optical path length
40 mm
Process pressure
10 bar
Continuous process temperature
0 ° C to +100 ° C (+32 ° F to 212 ° F)
Peak process temperature
+120 ° C (+248 ° F) for maximum duration of 15 minutes / day
Ambient temperature
0 ° C to +40 ° C (+32 ° F to 104 ° F)
Air purge
Connections available as standard
Light source
Incandescent tungsten lamp: 5.0 Vdc, 775 mA (typical life span 3 to 5 years)
Wave lengths
400 nm – 1100 nm
Detector
Silicon photodiodes hermetically sealed
Calibration
Basic calibration in ppm (DE), FTU, EBC
- 0 - 25 to 500 ppm (DE) - 0 - 10 to 200 FTU - 0 - 2.5 to 50 EBC
Any measuring range between
Measuring range
Resolution
< ± 0.5% of respective measuring range
Repeatability
< ± 1% of respective measuring range
Linearity
Specific to application, < ± 2% with standard solution
Protection
All optical parts protected according to IP65
Cable length
5.0 m (16 ft)
VA-plug-protection
Special ultra-shielded cable sets
Certificates
ISO 9001:2000, PED, CE, HPO
TI-P403-96 AB Issue 3
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Model 556 / TF56-N Turbidity Monitoring System
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