Fluid Components International 8-66B_12-64B Series Manual General Information - Manual (Page 2)

FLUID COMPONENTS INTL CHAPTER 1 - GENERAL INFORMATION
Model 12-64 Basic Flow Switch 1 - 2 Doc. No. 06EN003264 Rev. N/C
• Service:
- 12-64 - Liquid, gas or slurry flow detection.
- 8-66 - Point liquid level or interface detection.
• Process Connections:
1 inch male NPT.
• Insertion Length:
1.2 inch (30mm) or 2.0 inch (51mm) U-length.
• Material of Construction:
All wetted surfaces are 316 series stainless steel with
nickel braze per process specifications AMS 4777.
• Alarm Set Points:
Setable to any value within the indicated flow range,
(for 12-64). Setable to anyinterface value, (for 8-66).
5mV hysteresis.
• Time Response:
10 to 300 seconds.
• Flow Rate (12-64 only):
Minimum: .010 ft/sec (.003 m/sec) in oil,
Maximum: 125 ft/sec (38 m/sec) in air.
• Electrical Connection:
1 inch female NPT
• Relay Rating:
DPDT contacts rated at 2A at 115 Vac.
• Power Input:
100-132 Vac, 50/60 Hz, 6 watts maximum. 230 Vac
or 24 Vdc are optional power inputs.
• Local Enclosure:
NEMA 4X (approximately equal to IP66) and
suitable for hazardous locations.
• Operating Temperatures:
Sensing element: -100 ° to +350 ° F (-73 ° to +177 ° C).
Control circuit: -40 ° to +140 ° F (-40 ° to +60 ° C).
• Operating Pressure:
To 3000 psig (207 bar).
• Approvals:
FM, CSA and CE / CENELEC.
Control Circuit
The basic functions of the control circuit are to provide power to the sensing element, measure the D R between the
two RTDs, condition the sensing point signals, and provide relay alarm contacts for customer uses.
A double pole double throw (DPDT) relay is available in the instrument for connections to the customer alarm
systems. The relay coil can be set for either energized or de-energixed when there is either flow (wet) or no flow
(dry) of the process media. [The factory set condition is the coil being de-energized at no-flow (dry).]
The place where the relay changes state will vary depending on the type of media as well as air or liquid turbulence.
Therefore the instrument has a field adjustable alarm set point.
Specifications