Dwyer 646B User Manual

Bulletin P-646B

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RED = POWER GREEN = METER BLACK = POWER , METER

646B

METER

POWER

Series 646B Differential Pressure Transmitter

Specifications - Installation and Operating Instructions

Wiring

lack Ground

reen Output

G Red Supply

he Series 646B Differential Pressure Transmitter is designed to be used with

clean, dry air and other non-corrosive gases. Each unit features a flame retardant enclosure and a unique design which is suitable for circuit board mounting. Series 646B measures differential pressure at an accuracy of ±2.0% FS down to 0.5 in w.c. The transmitter contains a stainless steel sensor that provides resistance

gainst corrosion combined with excellent performance and long term stability.

he Series 646B transmitter features excellent stability, low hysteresis, accurate

peration over a broad temperature range, and exceptional insensitivity to

o vibration. These features make the transmitters perfect for VAV systems, filter monitoring, HVAC fan control, building pressurization, and leak detection systems.

Installation

Installation of the Series 646B is simplified with the use of molded mounting pads and color coded lead wires. Pressure connections will accept 1/8˝ to 3/16˝ ID tubing. See Table 1 below for the appropriate wiring connections. The unit should be mounted vertically with the pressure ports down to eliminate the effect of gravity error and avoid condensation inside the sensor.

CONNECTIONS

Cable Color

Black

Green

Red

TABLE 1

Operation

The Series 646B Differential Pressure Transmitters are factory calibrated at 5.00 ±0.25 VDC.

Connection

Ground Output

Supply Voltage (Vs)

SPECIFICATIONS

ervice: Air and non-combustible, compatible gases.

etted Materials: 302 SS, glass, nickel, polyethylene, acrylic and ABS.

ccuracy: ±2.0% FS* at room temperature.

*RSS (Root Sum Square) includes non-linearity, hysteresis and non-

repeatability.

Temperature Limits:

Operating: 23 to 170°F (-5 to 77°C);

torage: -6 to 185°F (-21 to 85°C).

Compensated Temperature: 32 to 170°F (0 to 77°C). Zero/Span Shift: < 0.05% FS/F (< 0.09% FS/C). Warm-Up Shift: ±0.1% FS. Position Effect: Unit is calibrated in a vertical position. Pressure Limits: ±10 psi (69 kPa). Output Signal: 0.5 to 4.5 VDC ratiometric. Output Impedence: < 5.0 Ω. Supply Voltage: 5.0 ±0.25 VDC. Response Time: Approximately 10 ms. Electrical Connection: Three stripped, color-coded lead wires, 26 AWG,

approximately 3.5˝ length.

Process Connections: 3/16˝ OD barbed fitting for 1/8˝ ID push-on tubing. Housing: PBT+ABS alloy. Weight: 3.1 oz (90 g).

Model 646B-03 646B-04 646B-05 646B-06 646B-07

Range in w.c.

0 to 0.5 0 to 0.1 0 to 2.5 0 to 5 0 to 10

MAINTENANCE/REPAIR

Upon final installation of the Series 646B, no routine maintenance is required. The Series 646B is not field serviceable and should be returned if repair is needed. Field repair should not be attempted and may void warranty.

WARRANTY/RETURN

Refer to “Terms and Conditions of Sales” in our catalog and on our website. Contact customer service to receive a Return Goods Authorization number before shipping the product back for repair. Be sure to include a brief description of the problem plus any additional application notes.

DWYER INSTRUMENTS, INC.

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

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A. Fax: 219/872-9057 e-mail: info@dwyermail.com