Dwyer Series 626 and 628 Pressure Transmitters

INTRODUCTION

The Series 626 & 628 Pressure Transmitters converts a single positive pressure into a standard 4-20 mA output signal. The Series 626 and 628 can be used to accurately measure compatible gases and liquids; Series 626 full-scale accuracy is 0.25%; Series 628 full-scale accuracy is 1.0% (see specifications). Designed for industrial environments with a NEMA 4X (IP66) housing, this transmitter resists most effects of shock and vibration

Operating Instructions

CAUTION

Do not exceed specified supply voltage ratings. Permanent damage not covered by warranty will result. This device is not designed for 120 or 240 VAC operation. Use only on 13-30 VDC.

INSTALLATION

Location:
Select a location where the temperature of the transmitter will be between 0 and 175°F (-18 to 79°C). Distance from the receiver is limited only by total loop resistance. The tubing or piping supplying pressure to the unit can be practically any length required but long lengths will increase response time slightly.

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. Position affects will be more noticeable on ranges below 30 psi.

Pressure Connection:
Use a small amount of plumber’s tape or other suitable sealants to prevent leaks. Be sure the pressure passage inside the port is not blocked.

Electrical Connections Wire Length
The maximum length of wire connecting the transmitter and receiver is a function of wire size and receiver resistance. Wiring should not contribute more than 10% of the receiver resistance to total loop resistance. For extremely long runs (over 1000 feet), choose receivers with higher resistance to minimize the size and cost of connecting leads. Where wiring length is under 100 feet, wire as small as 22 AWG can be used

SPECIFICATIONS

• Service: Compatible gases and liquids.
• Wetted Materials: Type 316 SS.
• Accuracy: 626: 0.25% FS, 0.20% RSS; 628: 1.0% FS, 0.5% RSS; 626 absolute ranges: 0.5% FS, 0.35% RSS (includes linearity, hysteresis, and repeatability).
• Temperature Limit: 0 to 200°F (-18 to 93°C).
• Compensation Temperature Range: 0 to 175° (-18 to 79°C).
• Thermal Effect: 626: ±0.02% FS/°F. 628: ±0.04% FS/°F (includes zero and span).
• Pressure Limits: See table.
• Power Requirements: 10-30 VDC (for
• 4 to 20 mA, 0-5, 1-5, 1-6 VDC outpus);
• 13-30 VDC (for 0-10, 2-10 VDC outputs);
• 5 VDC ±0.5 VDC (for 0.5-4.5 VDC ratiometric output).
• Output Signal: 4-20 mA, 0-5 VDC,1-5
• VDC, 0-10 VDC, or 0.5-4.5 VDC.
• Loop Resistance: 0-1000 Ω max. R
• max = 50 (Vps-10) Ω (4-20 mA output), 5
• KΩ min (0-5, 1-5,0.5-4.5 VDC output), 15
• KΩ min (1-6, 0-10, 2-10 VDC output).
• Current Consumption: 38 mA
• maximum (for 4 to 20 mA output); 10 mA
• maximum (for 0-5, 1-5, 1-6, 0-10, 2-10,
• 0.5-4.5 VDC output); 140 mA maxumum (for all 626/628/629-CH with optional LED).
• Electrical Connections: Model
• dependent options: Wire end, Hirschman
• DIN EN 175801-803-C, Packard,
• Deutsch, M12.
• Process Connection: Model dependent
• options: 1/8˝, 1/4˝, 1/2˝ male NPT; 1/4˝
• female NPT; 1/4˝ male or female BSPT;
• 1/8˝ or 1/4˝ male BSPP ISO 1179; 1/4˝
• female SAE valve depressor.
• Enclosure Rating: NEMA 4X (IP66).
• Mounting Orientation: Mount in any position.
• Weight: 10 oz (283 g).
• Compliance: CE.

CURRENT (4-20 mA) OUTPUT OPERATION

An external power supply delivering 10-30 VDC with minimum current capability of 40 mA DC (per transmitter) is required to power the control loop. See Figure A for connection of the power supply, transmitter and receiver. The range of appropriate receiver load resistance (RL) for the DC power supply voltage available is expressed by the formula:

Hirschman DIN Connector with 4-20 mA

When using cable version of -GH General Purpose Housing, black wire is negative [-] and red wire is positive [+]. When using optional Hirschman DIN Plug, remove top-center screw and lift off the terminal block assembly. Wire to terminals shown below in Figure B. For optional 4-pin M-12 connector, wire to pins

VOLTAGE (0-5, 1-5, 0-10, 1-6 or 2-10 VDC) OUTPUT OPERATION
(Other outputs contact the factory) See Figure E for connection of the power supply, transmitter and receiver.

Hirschman DIN Connector with Voltage Output

When using cable version of -GH General Purpose Housing, black wire is negative [-], red wire is positive [+] and white wire is output. When using optional Hirschman DIN Plug, remove top-center screw and lift off the terminal block assembly. Wire to terminals shown below in Figure F. For optional 4-pin M-12 connector, wire to pins as shown in Figure G. If utilizing optional A-164 cable for M-12 connection, brown wire corresponds to pin #1, white #2, blue

3, and black #4.

General Purpose

Housing with Ratiometric Output

When using cable version of -GH General Purpose Housing, black wire is negative [-], red wire is positive [+] and white wire is output. When using optional Hirschman DIN Plug, remove top-center screw and lift off the terminal block assembly. Wire to terminals shown below in Figure H. For optional 4-pin M-12 connector, wire to pins as shown in Figure I. If utilizing optional A-164 cable for M-12 connection, brown wire corresponds to pin #1, white #2, blue

3, and black #4.

Deutsche Connector with Voltage Output, Ratiometric and 4-20 mA
When using this cable version see Figure J for voltage output and ratiometric terminal connections. See Figure P for 4-20 mA terminal connections.

RATIOMETRIC (0.5-4.5 VDC) OUTPUT OPERATION

(Other outputs contact the factory) See Figure K for connection of the power supply, transmitter and receiver

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 626 and 628 transmitters are 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.

CE APPROVAL

Note : Accuracy is increased to ±3.6% when a 10 V/m between 80-1000 mhz RF field is applied.

Note : Please do not touch, cover or puncture vent filter.

NEED HELP

• DWYER INSTRUMENTS, INC.
• P.O. BOX 373
• MICHIGAN CITY, INDIANA 46360, U.S.A.
• Phone: 219-879-8000
• Fax: 219-872-9057
• www.dwyer-inst.com
• e-mail: info@dwyermail.com

References

• Dwyer Home

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