Dwyer Magnehelic Series 605 Differential Pressure Indicating Transmitter User Manual

Introduzione

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.

Figura 1: Davanti 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.

Informazioni sulla sicurezza

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.

• Assicurarsi che tutti i collegamenti elettrici siano conformi alle normative elettriche locali e nazionali.
• Per evitare scosse elettriche, scollegare l'alimentazione prima di effettuare qualsiasi collegamento elettrico.
• Do not exceed the maximum pressure rating of 25 PSIG.
• L'installazione e la manutenzione devono essere eseguite solo da personale qualificato.

Specifiche

Configurazione e installazione

Montaggio

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.

1. Selezionare una posizione adatta per il montaggio.
2. Secure the transmitter using appropriate hardware (not included).
3. Ensure the pressure ports are accessible for tubing connections.

Connessioni a pressione

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 "-".

• Connect the higher pressure source to the "HIGH" port.
• Connect the lower pressure source to the "LOW" port.
• Assicurarsi che tutti i collegamenti siano privi di perdite.

Cablaggio elettrico

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.

Operazione

Accendere

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.

Lettura del display

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").

Regolazione dello zero e dello span

The Series 605 features external zero and span adjustments. These adjustments affect both the visual indication and the 4-20 mA output.

1. Regolazione zero: 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.
2. Regolazione della portata: 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.

Manutenzione

The Dwyer Magnehelic Series 605 is designed for minimal maintenance. Regular checks ensure continued accuracy and reliable operation.

• Calibrazione periodica: It is recommended to periodically verify the zero and span calibration, especially if accuracy is critical or after significant environmental changes.
• Pulizia: Keep the exterior of the unit clean. Use a soft, damp panno. Non usare detergenti abrasivi o solventi.
• Pressure Port Inspection: Periodically inspect pressure tubing and connections for leaks or blockages.
• Condizioni ambientali: Assicurarsi che l'ambiente operativo rimanga entro gli intervalli di temperatura e umidità specificati.

Risoluzione dei problemi

Garanzia e supporto

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 websito.

Dwyer Instruments, Inc.
Michigan City, IN 46360 U.S.A.
www.dwyer-inst.com