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Cycle/sample type conductivity blowdown controller with high alarm. 1-10 min sample, 1-180 min cycle time. UL listed. Standard range 0-10,000 µS (No power cord or outlets.)
Requires sensor below and PL5 is recommended.
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SYSTEM OPTIONS (optional, select one or more)
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AV
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Audible and visible alarm with "PUSH TO SILENCE" pushbutton.
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-CR
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0-5 range front panel; conductivity range is 0-5,000 µS.
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-2
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Remote preamp input (use with SR2P or SR4P, below).
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-F
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250 VAC 50 Hz power option.
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CONTROLLER OUTPUT OPTIONS (optional, select one only)
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-35
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Isolated 4-20 mA output for conductivity remote data acquisition.
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-42
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HIGH/LOW conductivity dry alarm contacts with adjustable setpoints.
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-44
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Isolated 4-20 mA output, plus High/low alarms.
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SENSOR OPTIONS (recommended, select one below)
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SR2P
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Boiler water sensor with preamp & enclosure (only w/-2 above);
rated to 600 psi @ 486ºF (41.4 bar @ 252ºC).
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SR4P
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4 electrode sensor with preamp & enclosure (only w/-2 above);
rated to 250 psi @ 392ºF (17.2 bar @ 200ºC).
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SR2
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Boiler water sensor with 20 ft cable, 3/4 inch NPT;
rated to 600 psi @ 486ºF (41.4 bar @ 252ºC) with elbow.
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PLUMBING OPTIONS (recommended, select one below)
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PL5
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Plumbing for cycle sample assembly, 1/2 inch (1/8 & 1/16 orifice plates and union).
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PL575
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Plumbing for cycle sample assembly, 3/4 inch (1/8 & 1/16 orifice plates and union).
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GV
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1/2 inch forged globe valve for flow metering instead of an orifice plate and union.
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MOUNTING OPTIONS (optional, select one only)
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PM
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Panel mount 6 1/4 inch square cutout.
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BM
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Bracket for pipe mounting.
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BLOWDOWN VALVE OPTIONS (optional, select one only)
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MBV1
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Motorized 1/2 inch blowdown valve with 1036 actuator;
rated to 250 psi @ 400ºF (17.2 bar @ 204ºC).
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MBV2
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Motorized 3/4 inch blowdown valve with 1036 actuator;
rated to 250 psi @ 400ºF (17.2 bar @ 204ºC).
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MBV3
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High pressure motorized 1/2 inch blowdown valve with 1275 actuator;
rated to 600 psi @ 550ºF (41.4 bar @ 288ºC).
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MBV4
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High pressure motorized 3/4 inch blowdown valve with 1275 actuator;
rated to 600 psi @ 550ºF (41.4 bar @ 288ºC).
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PV4
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Pneumatic high pressure 1/2 inch blowdown valve with 1034 actuator;
rated to 600 psi @ 486ºF (41.4 bar @ 252ºC).
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The Model 250 Boiler Controller measures conductivity using the sample/cycle technique. The Model 250 is intended to control boiler water dissolved solids by measuring and controlling the surface blowdown water conductivity. By measuring the blowdown conductivity, the controller is capable of holding the boiler water conductivity with excellent results. This control results in considerable fuel savings by preventing excessive blowdown. The controller also protects the steam lines by preventing carry-over due to excessive conductivity.
