Transcript
Rheotherm_FlowSwitch_100_400_spec_D302
Liquid and Gas Flow Switches/Monitors • No Moving Parts • Easy installation • Field adjustable • 316 stainless steel construction • Maintenance-Free • Long-term reliability
RHEOTHERM® FLOW INSTRUMENTS INTEK
Overview Rheotherm flow switches combine an easy-to-install, low maintenance design with the most advanced thermal flow sensing technology. This combination provides high reliability flow switch protection in liquid or gas service. With no moving parts, Rheotherm flow switches are an excellent alternative to mechanical switches. These electronic instruments employ the same patented technology used in the unique Rheotherm flow meters. INTEK,INC. has used its extensive experience in precision flow metering to build the highest performance thermal flow switches available today. Reliable · No mechanical parts to stick, wear or break. · Rugged, all-metal wetted surface. · Proprietary designs use unstressed components, providing years of reliable operation. The heater does not burn out when process flow stops or the line empties. · Rheotherm flow sensors have been used by industry and aerospace since 1978. Easy-to-Use · No moving parts means little or no maintenance is required. · Factory-set switch point IS readily adjusted in the field as application requirements change. · Various process connection options make sensor integration simple. Versatile · Available for liquid, gas or slurry service. · Insertron probes or non-Intrusive sensors are available to accommodate virtually all flow rate ranges. · Sensors may be used in horizontal or vertical pipes.
Flow Switches
100CS with Probe
100FS with TU
Theory of Operation Rheotherm flow switches use Intek’s patented flow measurement technology, where the temperature differential between a reference temperature sensor and a heated temperature sensor is monitored. They can be configured for liquid, gas or slurry applications where reliable flow switching or single point level detection is required. Two (2) Resistance Temperature Detectors (RTDs) are utilized for the differential temperature measurement. One RTD provides the fluid temperature reference. The other RTD measures the temperature of an adjacent heater. The trip point is set to a temperature differential signal that represents a given flow rate. The Trip Point Flow switches are factory calibrated with a preset trip point. This trip point may also be adjusted in the field. With the model 100CS an optional timer is available for applications where an immediate trip is not desirable, such as pulsating flows or during system startup. With this option, the relay activation may be delayed from 6 to 360 seconds after the trip point is reached. Where response time requirements change, the model 400 has a selectable “normal” or “fast” relay activation. Selecting a fast response will activate the relay within 1 to 2 seconds in many applications. Level Detection For liquid level detection, an insertion probe sensor is used. A relay is activated as the liquid contacts (or loses contact) with the probe tips. The probe may be inserted at the top, bottom or various levels within a tank for reliable, singlepoint level indication.
100CS with TU
Model 400
Reliable. Rugged. Precise. With no moving parts and 316 SS/Nickel Braze construction, probe sensors are easy to install and extremely reliable. Generally used in 1” and larger pipes.
For low flow protection in small lines, the TU sensor is unique. With sensing components outside the flow tube, the design has an unobstructed flow path and an all 316 stainless steel wetted surface.
RHEO
RTD 1
Basic Models The basic model defines the electronics to be used with either a TU sensor or insertion probe. (Model 400 is not available with a TU sensor.) Model 100CS:
Flow switch (or level sensor) with integral electronics and one SPDT relay, rated 10 A at 120 Vac.
Model 1000FS:
Flow switch with separate electronics and one relay, or optional dual switch relays for low and high set points. Insertion probe with integral electronics, providing two SPDT relays or one relay and a non-linear, uncalibrated, 4-20 mA analog flow output signal (calibrated signal is optional). “Normal” or “fast” relay activation is a field-selectable feature.
Model 400:
Optional features listed below are not available with all three models. Specify options desired and INTEK will recommend the appropriate model number.
General Specifications Applications: Liquid, gas and slurries Set Point Ranges*: TU sensor: Liquids, 0.01 cc/min. to 20 GPM Gases, 0.004 to 80 SCFM Probe sensor: Liquids, 0.25 to 300 FPM Gases, 5 to 20,000 SFPM Temperature Limits*: Process: Standard, 0° to 140° F (-18° to 60°C) Optional, -20° to 500° F (-29° to 260°C) Environment: 0° to 120° F (-18° to 50°C) Pressure Limits: Per fitting working pressure limits Trip Response Time: The response time for a relay trip can be as fast as 1 second, depending on the set point and direction and magnitude of the flow change. A typical range is 2 to 25 seconds. The model 100CS has an optional time delay that can be set for 6 to 360 seconds. Repeatability: ±0.5% of reading
Standard
Options
Flow Signal (Model 400 only): Non-linear, 4-20 mA over 10:1 range
Input power:
115 Vac, 60 Hz
230 Vac, 50/60 Hz; 24-28 Vac, 60 Hz; 24 Vdc
*Specify requirement
Output:
SPDT relay
2 SPDT relays or 1 relay with non-linear, 4-20 mA
Enclosure:
NEMA 7 NEMA 4 (100FS)
NEMA 4 NEMA 7
Wetted surface:
Stainless Steel
other metals and alloys
Process connection: Probe Sensors TU sensors -
1" MNPT tube stubs
1" flange, sanitary, hot tap flanges, NPT, VCR, sanitary
Technology Leader
INTEK
INTEK, INC. 751 lntek Way Westerville, Ohio 43082-9057 tel: (614) 895-0301 fax: (614) 895-0319
In addition to flow switches, INTEK offers a comprehensive product line consisting of Rheotherm ® precision flow meters for liquid and gas measurements, including extremely low liquid flows of 10 cc/day. For assistance with any flow application, contact your local representative or an INTEK application engineer.
