Dwyer 646B - Manual

Series 646B Differential Pressure Transmitter
Specifications - Installation and Operating Instructions
Bulletin P-646B
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: [email protected]
SPECIFICATIONS
Service: Air and non-combustible, compatible gases.
Wetted Materials: 302 SS, glass, nickel, polyethylene, acrylic and ABS.
Accuracy: ±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);
Storage: -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).
2-31/64
[63.00]
1-27/32
[47.00]
23/64
[9.00]
2-7/16
[62.00]
ш5/32
[ш3.80]
31/64
[12.15]
5/32
[3.80]
3.5˝ LEAD
WIRES
1-1/64
[25.60]
The 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
against corrosion combined with excellent performance and long term stability.
The Series 646B transmitter features excellent stability, low hysteresis, accurate
operation over a broad temperature range, and exceptional insensitivity to
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.
Operation
The Series 646B Differential Pressure Transmitters are factory calibrated at 5.00
±0.25 VDC.
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
Wiring
Black Ground
Green Output
Red
Supply
CONNECTIONS
Connection
Ground
Output
Supply Voltage (Vs)
Cable Color
Black
Green
Red
TABLE 1
©Copyright 2014 Dwyer Instruments, Inc. Printed in U.S.A. 5/14 FR# R8-443885-00 Rev. 3
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.
RED = POWER
GREEN = METER
BLACK = POWER , METER
646B
METER
POWER