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Intek, Inc. warrants each Rheotherm product to be free from defects
in material and workmanship under normal use and service, Intek's
obligation under this warranty being limited to making good any part
or parts thereof which shall, within one (1) year after delivery of such
product to the original purchaser, be returned to Intek with
transportation charges prepaid and which Intek's examination shall
disclose to its satisfaction to have been thus defective; this warranty
being expressly in lieu of all other warranties, express or implied and
all other obligation or liabilities on Intek's part. The purchaser will
assume all responsibility and expense for removal, decontamination
and reinstallation of equipment.
Rheotherm flow meters are manufactured under United States patent numbers 4,255,968, 4,942,763 and
4,949,578. Intek, Rheotherm, Rheovec, RheoVac, RheoSmart and Rheomax are registered trademarks of
Intek, Inc.
TEL: (614) 895-0301 • FAX: (614) 895-0319
E-mail: techsupport@intekflow.com
WARRANTY
Intek, Inc.
751 Intek Way
Westerville, Ohio 43082-9057

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Summary of Contents for Intek Rheotherm 400

  • Page 1 Rheotherm flow meters are manufactured under United States patent numbers 4,255,968, 4,942,763 and 4,949,578. Intek, Rheotherm, Rheovec, RheoVac, RheoSmart and Rheomax are registered trademarks of Intek, Inc. Intek, Inc.
  • Page 2: Table Of Contents

    6.3 SPECIAL INSTRUCTIONS ......... . . - 15 - DRAWING 94080-5. Model 400 Flow Switch Field Wiring Interface ....- 16 - ©Intek, Inc. 2010 Manual no. 4000198 Rev.B...
  • Page 3: General Information

    Rheotherm flow monitors and flow switches offer reliable flow detection in liquids, gases and slurries. They are manufactured exclusively by Intek, Inc. and employ a patented thermal technique used by industry since 1978. The unique transducer designs have protected sensors, are easy to install and require little or no maintenance.
  • Page 4: Description Of Operation

    Hence, the measured temperature differential between the reference sensor and heated sensor is a function of flow rate. Intek, Inc. is licensed to use this patented and trademarked flow measurement technique. The Model 400 electronics converts this temperature difference and a portion of the fluid temperature signal into a temperature compensated and scaled flow output signal.
  • Page 5 Any special information pertaining to your unit is covered under CUSTOM INFORMATION (SECTION 6). Time should be taken to carefully read these instructions prior to installation of the equipment. Should any questions arise or problems occur, call Intek for immediate assistance.
  • Page 6: Installation

    SECTION 2 INSTALLATION 2.1 TRANSDUCER IMPORTANT: All transducers have a directional arrow on the tag and/or etched into a metal part. Before installing a sensor, please note proper flow direction. This is critical to sensor operation. IMPORTANT: If you have more than one Rheotherm unit, make sure the complete serial number of the transducer matches the complete serial number of the electronics module.
  • Page 7 transducer tag and/or etched into the transducer. All dual probe transducers (NPT/2I, BF/2I) are installed so that the two probes are side-by-side across the fluid stream. Never rotate the electronics housing. If this occurs the transducer can be damaged and/or installed misaligned with the flow direction.
  • Page 8 The probe transducer units, particularly when they are used as flow monitors, will give the most accurate results with a straight run of pipe upstream and down stream of the probe. Straight run length of 20 diameters upstream and 10 diameters downstream is recommended. TU or TUL (nonintrusive) —...
  • Page 9: Electronics

    effective in maintaining uniform fluid temperature. The ideal installation will provide the sensor with well established smooth flow, uniform system temperature and consistent fluid media. 2.2 ELECTRONICS The standard enclosure for the integral electronics is an explosion-proof cast junction box. CAUTION: The electronics are not protected against condensing liquid water inside the enclosure.
  • Page 10 transducer casing and therefore the analog output is isolated from earth ground. However, if the power select jumper is set in the “Lo” position, the analog output will not be isolated from the incoming power line. Install conduit such that all seals are watertight and rigidly secure. After pulling wire, pot the conduit near the enclosure if there is any possibility of them trapping water or moisture.
  • Page 11: Operation

    SECTION 3 OPERATION 3.1 START UP Typically, the instruments come from the factory set up for a 10 to 1 flow rate span, with the trip level set approximately at 10% of the full scale value. SECTION 6 details the instrument specifications. Following installation all that is required is to switch on power and initiate flow in the measurable flow rate range.
  • Page 12 - 10 -...
  • Page 13 A. Establish a flow rate at the desired trip point. The relay in standard flow switches is picked up (energized) when the flow level is above a set point. A low level is therefore indicated in the event of loss of power to the sensor when connected to N.C. contacts. Relay 2 will be energized with flow below the trip level.
  • Page 14: General Information

    TABLE II. Alarm2 Output Configuration (units with S2 option) NC2 - COM S1 Position Relay2 State LED1 Flow Rate Liquid Level contacts Closed de-energized Above set point Liquid Open energized Below set point The response time of the Model 400 can be changed between two settings: “Slow” and “Fast.” This change is made by moving the jumper shunt at JP7 (see Figure 4).
  • Page 15: Output Curve

    CUSTOM INFORMA-TION. 3.4 OUTPUT CURVE If the instrument is ordered with a calibrated output signal, the output curve for the unit can be found after SECTION 6. For an uncalibrated unit with a 4-20mA option, a typical curve is shown in Figure 6. Check SECTION 6 for the corresponding full scale Figure 5.
  • Page 16: Maintenance

    SECTION 4 MAINTENANCE 4.1 GENERAL MAINTENANCE Certain precautions should be taken to insure proper performance of all models of flow instruments. Since the measurement technique involves a signal resulting from heat transfer to the flowing medium, care should be exercised to prevent build-up of varying layers on the walls of the transducer. Layers such as bacterial growth, dried paints, gas bubbles and non-solubles can result in measurement below actual flow rates.
  • Page 17: Spare Parts

    In general, the curve shapes do not change if the zero and span values are set properly. If the instrument is being re-ranged, simply use a new full scale value and normalize the output curve to 100%. If extreme nonlinearities exist, such as that of a laminar to turbulent flow regime transition, a new curve will need to be constructed.
  • Page 18: Customer Service

    Rheotherm instrument you also receive Intek's outstanding customer service. For sales or product service, call your local representative or Intek directly at (614) 895-0301 8AM to 5PM EST/EDT weekdays or fax us anytime at (614) 895-0319. Our customer service staff will provide assistance promptly.
  • Page 19: Custom Information

    SECTION 6 CUSTOM INFORMATION 6.1 UNIT IDENTIFICATION Model no.: Serial no.: Customer identification: 6.2 CONFIGURATION The configuration of this unit, as originally shipped from the factory: Input Power: G 20-28 Vdc G 20-28 Vac G 100-130 Vac, 50/60 Hz G 200-240 Vac, 50 Hz G other Maximum Pressure: Full Scale Flow:...

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