The INVALCO CADM-201 and CADMEX-201 are floatless, diaphragm-operated liquid level controls. Liquid head pressure acts on the lower diaphragm chamber; when the level reaches the high set point the switch actuates and stays actuated until the level falls to the low set point. The CADM-201 carries a snap-action three-way Micro Valve for diaphragm motor valve control; the CADMEX-201 carries an explosion-proof Micro Switch for pumps, alarms or electric valves. The 2" process connection is recommended where paraffin or sediment is present, and there are no small orifices or chambers to plug. On pressurized vessels the head pressure is piped to the upper diaphragm chamber to correct for vessel pressure.
Key specifications
Temperature: -20 to 250 °F
Maximum high level: 22 ft water column
Maximum control span: 11 ft water column
Materials: Steel body, Buna-N diaphragm
Containment pressure: 100 psi
Process connection: 2" FNPT
CADM switch: Three-way Micro Valve, 1/4" NPT ports, 1/8" orifice, 100 psi max. working pressure
CADMEX switch: Explosion-proof Micro Switch, 15 A @ 125, 250 or 480 VAC, UL and CSA approved (SPDT or DPDT per ordering table)
Adjustment: High point by spring adjusting screw on top; low point by the double-collar switch actuator (14" clearance needed to remove the adjusting screw)
How to specify / order
Pneumatic (three-way Micro Valve): catalog CADM-201-834, part number 80000901
Electric, SPDT Micro Switch: catalog CADMEX-201-834, part number 80001106
Electric, DPDT Micro Switch: catalog CADMEX-201-834, part number 80001108
Per the bulletin, order by both part number and catalog model number
Recommended spares (both models): diaphragm 45003465, spring 45002688, tank seal washer 45003285, O-rings 67101532 / 67102309 / 67303423, gaskets 46001628 and 45002618; Micro Valve 87000019 (CADM) or Micro Switch 33100542 SPDT / 33110852 DPDT (CADMEX)
Bulletin notes: the SPDT and DPDT CADMEX versions share the same catalog number (CADMEX-201-834), so the part number is what separates them; the text describes the CADMEX-201 as SPDT only although the ordering table also lists a DPDT version; the item 9 screw is printed as 54015571 in the CADM-201 parts list and 65015571 in the CADMEX-201 list; and one application drawing labels the unit "CASMEX-201". Confirm with the factory before ordering.
Pricing and lead time are quoted per configuration. Send the model code (or your application details), product, flow range, and pressure/temperature to Flow Measurement Services for a quote. Specifications summarized from Smith Meter (INVALCO) bulletin SSIN011 Rev 0.1 (8/17); confirm current data with the factory before ordering.
Smith Meter (formerly FMC Technologies / TechnipFMC Measurement Solutions), now manufactured by Guidant. Flow Measurement Services supplies and services Smith Meter equipment.