Dwyer 677B - Manual

Series 677B Differential Pressure Transmitter
Specifications - Installation and Operating Instructions
Bulletin P-677B
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-conductive, non-corrosive gases.
Wetted Materials: 302 SS, glass, nickel, silicone rubber and brass.
Accuracy: ±0.4% FS* at room temperature.
*RSS includes non-linearity, hysteresis and non-repeatability.
Stability: ±1% FS/yr.
Temperature Limits:
Operating and Compensated: 0 to 185°F (-18 to 85°C);
Storage: -65 to 220°F (-54 to 105°C).
Pressure Limit: 15 psi (100 kPa).
Thermal Effects: (Includes zero and span) <0.028% FS/°F, 0 to 185°F (-18 to
85°C).
Power Requirement: 16 to 32 VDC.
Output: 4 to 20 mA DC, 2-wire.
Zero and Span Adjustments: Internally accessible potentiometers,
noninteractive.
Response Time: Approximately 10 ms.
Max. Loop Resistance: DC: 0 to 800 Ω.
Process Connection: 3/16˝ OD barbed brass pressure fitting.
Enclosure Rating: NEMA 4 (IP65).
Weight: 11.5 oz (330 g).
Agency Approval: CE.
19/32
[15.01]
1-9/32
[32.50]
1-27/64
[36.00] 49/64
[19.50]
1-3/16
[30.00]
5/16 [8.00]
1-25/64
[35.40]
WITH COVER REMOVED
MOUNTING PLATE
5-1/8
[130.00]
17/64
[6.90]
3/16
[4.60]
5-1/2 [139.70]
2-9/16
[65.00]
4-17/32
[115.00] 4-3/64
[102.90] COVER
Series 677B Differential Pressure Transmitters are designed to measure
pressures as low as 0.1 in w.c. with ±0.4% accuracy. Use Series 677B for building
energy management systems, environmental pollution control, oven
pressurization, lab and fume hood control, HVAC and VAV applications. The
transmitter features 15 psid overpressure, reverse polarity protection and
EMI/RFI protection. Internal regulation permits use with unregulated DC power
supplies. The NEMA 4 housing allows for versatile mounting locations and
integral mounting tabs simplify installation.
Mounting
Series 677B is designed for mounting by using the two (2) slots (suitable for #6
and #8 screws) that are provided on the mounting baseplate. For optimum
performance, isolate the instrument from vibration and provide relatively clean, dry
air to the pressure ports.
Note: Even though there is no flow through the 677B, a filter is located in both the
high and low pressure ports for use in extreme dust or moisture conditions.
In most applications, preferred installation is with the baseplate mounted vertically
and located on a flat surface in a junction box or attached to a nearby beam. Quick
and easy field replacement is possible by removing the two case screws that hold
the housing to the baseplate and lifting the housing free. The baseplate will remain
mounted and can be used with the replacement units housing.
Piping
Two (2) 3/16˝ OD barbed pressure fittings are provided for pressure connection
with 3/16˝ or 1/8˝ ID push on tubing. For best results, 1/8˝ ID tubing is suggested
for tubing lengths up to 100 feet long.
The overpressure limit with the new tension diaphragm construction is up to 15 psi
regardless of range.
Model
677B-01
677B-02
677B-03
677B-04
677B-05
677B-06
677B-07
677B-08
677B-11
677B-12
677B-13
677B-14
677B-15 Range (in w.c.)
0 to 0.1
0 to 0.25
0 to 0.5
0 to 1
0 to 2.5
0 to 5
0 to 10
0 to 25
0 to ±0.05
0 to ±0.1
0 to ±0.25
0 to ±0.5
0 to ±1 The axis most sensitive to vibration is the one perpendicular to
the baseplate. Avoid mounting with maximum vibration along
axis.
NOTICE