Cycle/Sample Boiler Controller Model 250
From Lakewood Instruments


Lakewood Instruments Model 250 Cycle/Sample Boiler Controller

Discontinued Model

 

Cycle,Sample,Boiler,Controller,Model 250,Lakewood,InstrumentsThe 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.

The Model 250 uses the sample/cycle technique and is intended for boilers of less than 1,000 lb./hr under normal operating loads.

Model 250 Boiler Controller Manual

Specifications

Inputs
Power
120 VAC
120/240VAC w/-F
Sensor
2 electrode Conductivity
Sensor (SR2)
Pressure
600 psi (41.4 bar)
Max. Temperature
486ºF (252ºC)
Body
Carbon Steel
Electrode
416SS
Insulator
PEEK
Connection
3/4 inch MNPT
Outputs
Relays
3 Amps @ 120 VAC
0-1 mA
Non isolated
4-20 mA
Isolated, w/-35
Controller
Conductivity Range
0-10,000 µS
Accuracy
+/-100 µS
Resolution
100 µS
Deadband
Adjustable
Setpoint
0-10,000 µS
High Alarm
Adjustable
Sample Time
0-10 min
Cycle Time
0-180 min
Ambient Temperature
32-158ºF (0-70ºC)
Electrical Rating
UL Listed
Enclosure Rating
ABS Plastic

Ordering Information

250  
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 ÁS (No power cord or outlets.)
Requires sensor below and PL5 is recommended.
 
SYSTEM OPTIONS (optional, select one or more)
AV
Audible and visible alarm with "PUSH TO SILENCE" pushbutton.
-CR
0-5 range front panel; conductivity range is 0-5,000 µS.
-2
Remote preamp input (use with SR2P or SR4P, below).
-F
250 VAC 50 Hz power option.
CONTROLLER OUTPUT OPTIONS (optional, select one only)
-35
Isolated 4-20 mA output for conductivity remote data acquisition.
-42
HIGH/LOW conductivity dry alarm contacts with adjustable setpoints.
-44
Isolated 4-20 mA output, plus High/low alarms.
SENSOR OPTIONS (recommended, select one below)
SR2P
Boiler water sensor with preamp & enclosure (only w/-2 above);
rated to 600 psi @ 486ºF (41.4 bar @ 252ºC).
SR4P
4 electrode sensor with preamp & enclosure (only w/-2 above);
rated to 250 psi @ 392ºF (17.2 bar @ 200ºC).
SR2
Boiler water sensor with 20 ft cable, 3/4 inch NPT;
rated to 600 psi @ 486ºF (41.4 bar @ 252ºC) with elbow.
PLUMBING OPTIONS (recommended, select one below)
PL5
Plumbing for cycle sample assembly, 1/2 inch (1/8 & 1/16 orifice plates and union).
PL575
Plumbing for cycle sample assembly, 3/4 inch (1/8 & 1/16 orifice plates and union).
GV
1/2 inch forged globe valve for flow metering instead of an orifice plate and union.
MOUNTING OPTIONS (optional, select one only)
PM
Panel mount 6 1/4 inch square cutout.
BM
Bracket for pipe mounting.
BLOWDOWN VALVE OPTIONS (optional, select one only)
MBV1
Motorized 1/2 inch blowdown valve with 1036 actuator;
rated to 250 psi @ 400ºF (17.2 bar @ 204ºC).
MBV2
Motorized 3/4 inch blowdown valve with 1036 actuator;
rated to 250 psi @ 400ºF (17.2 bar @ 204ºC).
MBV3
High pressure motorized 1/2 inch blowdown valve with 1275 actuator;
rated to 600 psi @ 550ºF (41.4 bar @ 288ºC).
MBV4
High pressure motorized 3/4 inch blowdown valve with 1275 actuator;
rated to 600 psi @ 550ºF (41.4 bar @ 288ºC).
PV4
Pneumatic high pressure 1/2 inch blowdown valve with 1034 actuator;
rated to 600 psi @ 486ºF (41.4 bar @ 252ºC).

 

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