Taiwan 0809 090 375 | Intl +65 6415 5353 | Welcome to our new site - found a bug? Please report it here
Series-677B
677B Low Pressure DP Transmitter, ± 0.4% Accuracy, NEMA 4 Housing
- NEMA 4 housing enables a range of use outdoor or indoor where water is present
- High accuracy at low pressure ranges provides exceptional measurement for insuring tight-control and minimizing costly out of specification conditions
- Use with unregulated DC power permits easy access to electrical supply reducing costly power conditioning and wiring
Series-677B
From
TWD
15,391
Product Overview
- Accuracy Detail ± 0.4% FS* at room temperature
- Applications Energy Management Systems, HVAC
- Compensated Temperature, Max 85 °C
- Compensated Temperature, Min -18 °C
- Display Type N/A
- Enclosure Ratings IP65, NEMA Type 4
- Long Term Stability ± 1% FS/year
- Media Compatibility Clean dry air / inert gas, HVAC / room air, Inert / non-reactive gases, Helium, Nitrogen, Non-Conductive Gases, Non-Corrosive Dry Gases
- Number of Wires 2
- Operating Temperature, Max 85 °C
- Operating Temperature, Min -18 °C
- Measurement Pressure Type Differential
- Process Connection Note OD barbed brass pressure fitting
- Process Connection Size 3/16 in
- Process Connection Type Barbed Fitting
- Response Time 10 ms
- Series ID Series-677B
- Span Adjustment Potentiometers
- Storage Temperature, Max 105 °C
- Storage Temperature, Min -54 °C
- Thermal Effects <0.028% FS/°F
- Thermal Effects Note (Includes zero and span) <0.028% FS/°F, 0 to 185°F (-18 to 85°C).
- Weight 330 g
- Zero Setting Adjustable Range Internally accessible potentiometers, noninteractive
Supported Applications
The Dwyer Series 677B Differential Pressure Transmitters are designed to measure pressures as low as 0.1 in w.c. with ±0.4% accuracy. The series is suitable for building energy management systems, environmental pollution control, oven pressurization, lab and fume hood control, HVAC and VAV applications.
Operating Conditions & Performance
The Series 677B operates within an ambient temperature range of 0 to 185°F (-18 to 85°C) with a storage limit of -65 to 220°F (-54 to 105°C). Accuracy is specified as ±0.4% FS* at room temperature, where RSS (Root Sum Square) includes non-linearity, hysteresis and non-repeatability. Thermal effects are rated at <0.028% FS/°F across the operating range of 0 to 185°F (-18 to 85°C). The transmitter features a response time of approximately 10 ms.
Pressure limits include a service rating of 15 psi (100 kPa) and an overpressure limit up to 15 psid regardless of range. Wetted materials consist of 302 SS, glass, nickel, silicone rubber, and brass. The device is intended for use with air and non-conductive, non-corrosive gases.
Configuration Options
The series offers a broad selection of differential pressure ranges to accommodate specific low-pressure requirements:
- Unidirectional Ranges (0 to X in w.c.): 0.1, 0.25, 0.5, 1, 2.5, 5, 10, and 25.
- Bipolar Ranges (0 to ±X in w.c.): ±0.05, ±0.1, ±0.25, ±0.5, and ±1.
The transmitter provides a 4 to 20 mA DC, 2-wire output signal compatible with loads of 0 to 800 Ω. It requires a power supply between 16 to 32 VDC and includes internal regulation for use with unregulated DC sources. Electrical connections are made via internally accessible potentiometers.
Housing features include a NEMA 4 (IP65) enclosure with integral mounting tabs. The process connection is a 3/16" OD barbed brass pressure fitting, which incorporates filters in both high and low pressure ports for extreme dust or moisture conditions. Optional accessories include static pressure tips such as the A-489 (4" straight tip with flange) and A-302F-A (303 SS tip), along with a NIST traceable calibration certificate.
Key Product Differences
The Series 677B is distinguished by its model number suffix, which corresponds directly to the measurement range. Models ending in -01 through -08 represent unidirectional ranges from 0 to 0.1 up to 0 to 25 in w.c., while models -11 through -15 denote bipolar spans ranging from ±0.05 to ±1 in w.c.
The unit is factory calibrated and should require no field adjustment; zero and span offsets are intended to be corrected by software adjustment in the user's control system. The Series 677B is not field serviceable, and any repair requires returning the unit with a return goods authorization number.
PDFs & Manuals
