Dwyer 644 User Manual

Series 644 - Industrial Pressure Transmitter

Specifications - Installation and Operating Instructions

The Series 644 Industrial Pressure Transmitter is a robust transmitter designed

for high accuracy pressure applications. Boasting an accuracy of ±0.05% FS RSS (<±0.25% TEB), the 644 is intended for precise measurements in the critical applications of calibration technology, hydraulic/pneumatic controls, and many more laboratory and industrial settings. The Series 644 offers multiple measurement options with two output choices (VDC or mA) and ten psig pressure ranges (optional 0 to 15 psia). The robust and compact all stainless steel Series 644 is available with either a 1/4˝ male NPT, or 7/16˝-20 male SAE process connections. Each transmitter is provided with an 11 point NIST traceable calibration certificate.

Range

Number

0 to -14.7 psig

0 to 15 psig

0 to 25 psig

0 to 50 psig

0 to 100 psig

0 to 150 psig

0 to 200 psig

0 to 300 psig

0 to 500 psig

0 to 750 psig

0 to 1000 psig

0 to 15 psia

INSTALLATION

1. Environment

The operating temperature limits of the 644 are -40 to 185°F (-40 to 85°C). The compensated temperature range is -4 to 140°F (-20 to 60°C).

Proof Pressure

30 psig 30 psig 50 psig 100 psig 200 psig 300 psig 400 psig 600 psig 800 psig 1200 psig 1500 psig 30 psia

Burst Pressure

3000 psig 3000 psig 3000 psig 8000 psig 10000 psig 10000 psig 10000 psig 10000 psig 10000 psig 10000 psig 10000 psig 3000 psia

4-3/4

[120.42]

Bulletin P-644

3 FT CABLE

CONNECTION (-L)

Ø1-5/16

[Ø33.02]

3-5/16

[83.44]

1 [25.63]

SPECIFICATIONS Service: Compatible gases and liquids. Wetted Materials: 17- 4 PH SS. Accuracy: ±0.05% FS RSS. Total Error Band (Includes all thermal effects): <±0.25% FS over entire

temperature compensated range.

Stability: < 0.15% FS/year. Operating Temperature Limits: -40 to 185°F (-40 to 85°C). Pressure Limits: Proof pressure and burst pressure: See pressure limits table

below.

Compensated Temperature Range: -4 to 140°F (-20 to 60°C). Power Requirements:

9 to 30 VDC for current output; 15 to 30 VDC for voltage output.

Minimum Supply Voltage:

Min. supply voltage (VDC) for current output = 9 + 0.02 x loop resistance Ω (loop resistance Ω = line resistance + receiver resistance).

Output Signal:

0 to 10 VDC (4-wire); 4 to 20 mA (2-wire).

Response Time: < 10 ms (voltage output), < 80 ms (current output). Max Current Consumption:

4 to 20 mA: 22 mA; 0 to 10 VDC: 20 mA.

Electrical Connections: 3 ft cable or 6-pin male bayonet connector. Process Connection: 1/4˝ male NPT or 7/16˝-20 male SAE with O-ring. Enclosure Rating: NEMA 4X (IP65). Mounting Orientation: Vertical. Weight: 9 oz (254 g). Agency Approvals: CE.

BAYONET CONNECTOR

6-PIN (-B)

1/4-NPT (-P)

7/16˝-20 SAE MALE (-S)

2. Pressure Fittings

Available pressure fittings are given in table below:

Pressure Port Code

-P

-S

3. Installation of Pressure Fittings

Your transmitter is designed for most accurate operation when subjected to pressures within the designated pressure range. Refer to the catalog bulletin specifications for proof pressure limits.

For the most sensitive pressure ranges, excessive high torquing of a metal pressure fitting may cause slight zero shift which may be trimmed out using the zero adjustment. Use of a plastic fitting often shows no noticeable zero shift. The torquing effect does not appreciably affect linearity or sensitivity. The wrench flat on the Series 644 must be used when installing the positive pressure fitting.

DWYER INSTRUMENTS, INC.

Fitting Description

1/4˝-18 male NPT 7/16˝- 20 male SAE

Phone: 219/879-8000 www.dwyer-inst.com

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, U.S.A. Fax: 219/872-9057 e-mail: info@dwyer-inst.com

4. Position: The transmitter is not position sensitive. However, all standard models

are originally calibrated with the unit in a position with the pressure connection downward. Although they can be used at other angles, for best accuracy it is recommended that units be installed in the position calibrated at the factory.

ELECTRICAL INSTALLATION

1. Electrical Connections: The 644 is available with cable version or bayonet

connector options having different connector pin outs shown in table below:

Wiring Codes Electrical Connection

+ EXC

- EXC + Sig Out

- Sig Out

2. Voltage Output Units

The Series 644 voltage units are four-wire type circuit with 0 to 10 VDC analog output.

3. Current Output Units

The Series 644 current units are two-wire loop-powered 4 to 20 mA current output and delivers rated current into any external load of 0 to 800 ohms.

The current flows into the + terminal and returns back to the power supply through the

- terminal (see Diagram 1). The power supply must be a DC voltage source with a voltage range between 9 and 30 measured between the + and - terminals. The unit is calibrated at the factory with a 24 VDC loop supply voltage and a 250 ohm load.

Cable Wire Color

Red Black Green White

Code-B Bayonet Connector Pinout

A D B C

Diagram 1

MAINTENANCE

After final installation of the pressure transmitter and its companion receiver, no routine maintenance is required. A periodic check of system calibration is suggested. The Series 644 transmitter is not field repairable and should be returned if repair is needed (field repair should not be attempted and may void warranty). Be sure to include a brief description of the problem plus any relevant application notes. Contact customer service to receive a return goods authorization number before shipping.

DWYER INSTRUMENTS, INC.

Phone: 219/879-8000 www.dwyer-inst.com

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, U.S.A. Fax: 219/872-9057 e-mail: info@dwyer-inst.com