Indledning
The Dwyer Magnehelic Series 605 Indicating Transmitter is designed for both visual monitoring and electronic control of very low differential pressure. This device is suitable for control applications in building HVAC systems, providing local indication for routine maintenance and system troubleshooting. It combines the reliable Dwyer Magnehelic gauge mechanical design with Series 600 transmitter technology, offering a two-wire, 4-20 mA control signal. The terminal strip on the rear simplifies connection to any 4-20 mA control loop powered by a 10-35 VDC supply.
Figur 1: Front view of a Dwyer Magnehelic Indicating Transmitter. The dial displays pressure in inches of water, with a visible range from 0 to 1.0. The face includes the "Magnehelic" brand, "Indicating Transmitter" label, maximum pressure rating (25 PSIG), and patent information. Adjustment screws for "SPAN" and "ZERO" are visible at the bottom, along with the Dwyer logo. Note that the specific model 605-3 covered in this manual has a 0-3.0"WC range.
Sikkerhedsoplysninger
Read this manual thoroughly before installing, operating, or servicing this device. Failure to follow these instructions may result in product damage, property damage, or serious injury. Keep this manual for future reference.
- Sørg for, at alle elektriske forbindelser overholder lokale og nationale elektriske forskrifter.
- Disconnect power before making any wiring connections to prevent electrical shock.
- Do not exceed the maximum pressure rating of 25 PSIG.
- Installation og service bør kun udføres af kvalificeret personale.
Specifikationer
| Parameter | Værdi |
|---|---|
| Modelnummer | 605-3 |
| Trykområde | 0-3.0"WC (Inches of Water Column) |
| Udgangssignal | 4-20 mA, 2-wire |
| Strømforsyning | 10-35 VDC |
| Maksimalt tryk | 25 PSIG |
| Produktdimensioner | 7.6 x 6.8 x 3.7 tommer |
| Vægt | 2.35 pund |
| Fabrikant | Dwyer instrumenter |
Opsætning og installation
Montering
The Series 605 can be flush mounted or surface mounted. Ensure the mounting location is free from excessive vibration and within the specified operating temperature range. The device should be mounted vertically for accurate readings.
- Vælg et passende sted til montering.
- Secure the transmitter using appropriate hardware (not included).
- Ensure the pressure ports are accessible for tubing connections.
Trykforbindelser
Connect the pressure tubing to the high and low pressure ports located on the back of the unit. Use appropriate tubing and fittings for the application. The high pressure port is typically marked "HIGH" or "+", and the low pressure port "LOW" or "-".
- Tilslut kilden med højere tryk til "HIGH"-porten.
- Connect the lower pressure source to the "LOW" port.
- Sørg for, at alle forbindelser er lækagefri.
Elektriske ledninger
The Series 605 utilizes a two-wire, 4-20 mA output. Connect the transmitter to a 10-35 VDC power supply and the control system as follows:
- Connect the positive (+) terminal of the power supply to the positive (+) terminal of the transmitter.
- Connect the negative (-) terminal of the transmitter to the input of the control system (e.g., PLC, DCS).
- Complete the loop by connecting the return of the control system to the negative (-) terminal of the power supply.
- Ensure proper polarity to avoid damage.
Operation
Tænd
Once all connections are secure, apply power to the unit. The analog output will begin to transmit a 4-20 mA signal corresponding to the measured differential pressure.
Læsning af displayet
The Magnehelic gauge provides a local visual indication of the differential pressure. The red pointer on the dial indicates the current pressure in inches of water column ("WC").
Nul- og spændviddejustering
The Series 605 features external zero and span adjustments. These adjustments affect both the visual indication and the 4-20 mA output.
- Nuljustering: With no pressure applied (both ports open to atmosphere or connected to the same pressure), adjust the "ZERO" screw (typically located at the bottom right of the dial) until the pointer reads 0"WC. This also calibrates the 4 mA output.
- Spændviddejustering: Apply a known full-scale pressure (e.g., 3.0"WC for a 0-3.0"WC range). Adjust the "SPAN" screw (typically located at the bottom left of the dial) until the pointer reads the full-scale value. This calibrates the 20 mA output. Repeat zero and span adjustments as necessary for optimal accuracy.
Opretholdelse
The Dwyer Magnehelic Series 605 is designed for minimal maintenance. Regular checks ensure continued accuracy and reliable operation.
- Periodisk kalibrering: It is recommended to periodically verify the zero and span calibration, especially if accuracy is critical or after significant environmental changes.
- Rensning: Keep the exterior of the unit clean. Use a soft, damp klæde. Brug ikke slibende rengøringsmidler eller opløsningsmidler.
- Pressure Port Inspection: Periodically inspect pressure tubing and connections for leaks or blockages.
- Miljøforhold: Sørg for, at driftsmiljøet forbliver inden for de angivne temperatur- og luftfugtighedsområder.
Fejlfinding
| Problem | Mulig årsag | Løsning |
|---|---|---|
| No Indication / No Output | No power; Incorrect wiring; Blocked pressure ports; Damaged unit. | Check power supply (10-35 VDC); Verify wiring connections and polarity; Inspect pressure ports and tubing for obstructions; Contact technical support if unit is damaged. |
| Upræcise aflæsninger | Out of calibration; Leaks in pressure lines; Incorrect mounting position; Environmental factors. | Perform zero and span calibration; Check all pressure connections for leaks; Ensure unit is mounted vertically; Verify operating environment. |
| Output Signal Stuck at 4 mA or 20 mA | Sensor fault; Wiring issue; Over-range/Under-range pressure. | Check pressure applied is within range; Verify wiring integrity; Contact technical support. |
Garanti og support
Dwyer Instruments, Inc. warrants this product to be free from defects in material and workmanship for a period of one year from the date of shipment. For full warranty details, technical support, or service, please contact Dwyer Instruments directly. Contact information can be found on the official Dwyer webwebsted.
Dwyer Instruments, Inc.
Michigan City, IN 46360 U.S.A.
www.dwyer-inst.com
