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Dwyer Air Quality Products

Wall Mount Humidity / Temperature / Dew Point Transmitter

Wall Mount Humidity / Temperature / Dew Point Transmitter

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Product Details:
Range0 to 100% RH
Temprature-28.9 to 60 degree celsius
Weight0.3 lb
Optional LCD Display, Replaceable Sensors

The Series RHP-W Wall Mount Temperature/Humidity/Dew Point Transmitteris the most versatile room transmitter on the market. The stylish housing is well vented to provide air flow across the sensor to improve measurement accuracy.

An optional LCD display can be integral to the transmitter or a remote display can be ordered for building balancing or LEED® validation.

The LCD display indicates the ambient temperature along with the humidity or dew point. The transmitter has internal dip switches to select the temperature engineering units and whether the transmitter outputs humidity or dew point.The humidity and temperature sensors are field replaceable to reduce service cost and inventory.

The humidity and dew point can have either a current or voltage output, while the optional temperature output can be a current, voltage, RTD or thermistor.

Thermistor or RTD For models with current or voltage for the temperature output, the temperature range is field selectable.

  • Relative Humidity Range:0 to 100% RH
  • Temperature Range:-40 to 140°F (-40 to 60°C) for thermistor and RTD sensors. -20 to 140°F (-28.9 to 60°C) for solid state band gap temperature sensors
  • Dew Point Temperature Range:-20 to 140°F(-28.9 to 60°C); 0 to 100°F (-17.8 to 37.8°C); 40 to 90°F(4.4 to 32.3°C); -4 to 140°F (-20 to 60°C) field selectable ranges
  • Accuracy:RH:Model RHP-2XXX ±2% 10-90%RH @ 25°C; Model RHP-3XXX ±3%
  • 20-80% RH@ 25°C; Model RHP-5XXX ±5% 20-80% RH @ 25°C; Thermistor temperature sensor:±0.36°F @ 77°F (±0.2°C @ 25°C); RTD temperature sensor:DIN Class B; ±0.54°F @ 32°F (±0.3°C @ 0°C);Solid state band gap temperature sensor:±0.9°F @ 77°F (±0.3°C @ 25°C)
  • Hysteresis:±1%
  • Repeatability:±0.1% typical
  • Temperature Limits:Operating: -40 to 140°F (-40 to 60°C); Storage:-40 to 176°F (-40 to 80°C)
  • Compensated Temperature Range:-4 to 140°F (-20 to 60°C)
  • 4-20 mA Loop Powered Outputs: Power requirements:10 to 35 VDC; Output signal:4 to 20 mA, 2 channels for humidity/solid state temperature sensor models (loop powered on RH). Switch selectable RH/dew point. Switch
  • selectable normal or reverse output
  • 0-5/10V Outputs:Power requirements:15 to 35 VDC or 15 to 29 VAC; Output load: 5 mA max., 2 channels for humidity/solid state temperature sensor models. Switch selectable 0-10V/2-10V or 0-5V/1-5V output. Switch selectable RH/dew point. Switch selectable normal or reverse output
  • Solid State Band Gap Temperature Sensor Output Ranges:Switch selectable, -20 to 140°F(-28.9 to 60°C); 0 to 100°F (-17.8 to 37.8°C); 40 to 90°F(4.4 to32.3°C); -4 to 140°F (-20 to 60°C)
  • Response Time:15 seconds
  • Electrical Connections:Screw terminal block
  • Drift:<1% RH/year
  • RHSensor:Capacitance polymer
  • Enclosure Material:Warm gray polycarbonate
  • Display:Optional LCD, backlit on 0-5/10V models. Switch selectable %RH or dew point, °F/°C
  • Display Resolution:RH:1%; Temperature:0.1°F(0.1°C); Dew Point:1°F(1°C)
  • Weight:0.3 lb (0.14 kg)
  • Agency Approvals:CE

Additional Information:

  • Item Code: SeriesRHP-W
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Fume Hood Monitor

Fume Hood Monitor

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Product Details:
Minimum Order Quantity1 Piece
Alarm IndicationRed LED
Alarm Range30-400 FPM
Weight5.0 oz
Ensures Proper Fume Hood Performance

The Model 670 Fume Hood Monitor continuously senses air flow through the face of the fume hood, ensuring safe levels of fresh air are exhausting potentially hazardous fumes eliminating operator exposure.

The 670 provides a highly accurate hot wire sensor to detect very low flows common on fume hoods.

LED safe and alarm status indicators, audible alarm with temporary or permanent horn silence, relay alarm output, sash alarm input and an input for night set-back.

The Model 670 comes with everything required to quickly install the unit including a mounting bracket, 24 of tubing for connecting to the inside of the hood wall and a 120 Volt AC power adapter.

  • Service: Fume hood face velocity air flow
  • Alarm Range: 30-400 FPM (0.15-2.0 m/s)
  • Alarm Indication: Red LED & audible alarm
  • Low Air Velocity Alarm Delay: Fixed 5 secs
  • Visual LED Display: Red: Alarm;Green: Normal
  • Horn Silence: Yes-temporary and permanent
  • Accuracy: Face velocity ±10%.
  • Temperature Limits: Operating temperature: 55 to 86°F (13 to 30°C); Storage temperature: -40 to 150°F (-40 to 65°C)
  • Power Requirement: 15 VDC 500 mA; 120 VAC, 60 Hz power transformer included
  • Sash High Indication: Using a two wire micro switch or 3 wire proximity switch input, rated for 24 VDC usage
  • Mounting: Semi flush, flush or surface mounted when using included bracket
  • Weight: 5.0 oz (141 g)
  • Agency Approval: CE
  • Relay Output Low Air Flow Alarm: 5 amps @ 250 VAC
  • Relay Input For Night Setback: 2 wire rated for 24 VDC usage

Additional Information:

  • Item Code: Model670
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Duct Mounted Airflow Measurement Station

Duct Mounted Airflow Measurement Station

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Product Details:
Minimum Order Quantity1 Piece
Velocity Range100 to 10,000 FPM
Process Connections1/4 compression fittings
Integral Flow Straightener, Ideal for Turbulent Measuring Conditions

The Series STRA Airflow Measurement Stationis easy to install – simply connect the tubing to the station fittings, then to a differential pressure manometer, gage, transmitter or switch. Single or multiple airflow elements are factory mounted and pre-piped in a casing designed for flanged connection to the ductwork.

The Series STRA utilizes an airflow averaging element in a head-type device, generating a differential (velocity) pressure signal similar to the orifice, venturi, and other head producing primary elements.

  • Accuracy: Within 2% of actual flow when installed in accordance with published recommendations
  • K Factor:0.97
  • Velocity Range:100 to 10,000 FPM (0.51 to 51 m/s)
  • Wetted Materials: Elements: 6063-T5 anodized aluminum;Casings: 16 ga G90 galvanized steel, 3003 aluminum air flow straightener
  • Temperature Limits: Galvanized casings & aluminum elements 350°F (177°C) continuous operation (in air), 400°F (204°C) intermittent operation (in air)
  • Humidity Limits:All airflow stations 0 to 100% non condensing
  • Process Connections: 1/4 compression fittings

Additional Information:

  • Item Code: SeriesSTRA
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Bypass Damper Switch

Bypass Damper Switch

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Product Details:
Model Name/NumberSERIES BYDS
Country of OriginMade in India
Controls Zone Static by Modulating Motorized Damper

The Series BYDS Bypass Damper Switch is designed to control motorized bypass dampers. As individual zone dampers open and close, the system static pressure will rise and fall. In order to maintain proper airflow and static pressure through the HVAC system, a bypass system incorporating a floating type motorized damper and a static pressure control should be incorporated. A typical on/off pressure switch cannot operate in this application due to the high cycle rate that would result, eventually causing contact burn-out. The BYDS static pressure control is equipped with a solid-state switching and timing circuit to enhance operation and improve long-term reliability in this demanding application.

  • Service: Air and non-combustible, compatible gases
  • Materials: Diaphragm material:Silicone;Housing material: Switch body: PA 6.6 and POM; Cover:Polystyrene
  • Temperature Limits: Process and ambient temperature from 32 to 122°F(0 to 50°C)
  • Pressure Limits: Max. operating pressure:40 in w.c. (10 kPa) for all pressure ranges
  • Switch Type: SPDT
  • Electrical Rating: 1A @ 24 VAC
  • Electrical Connections:Screw terminal block. M20 x 1.5 with cable strain relief or 1/2 NPTconnection
  • Process Connections: 5/16 (7.94 mm)outside diameter tubing, 1/4 (6.0 mm) inside diameter tubing
  • Enclosure Rating:NEMA13 (IP54)
  • Mounting Orientation:Vertically, with pressure connections pointing downwards
  • Mechanical Working Life:Over 106 switching operations
  • Weight: 5.6 oz (160 g)
  • Agency Approvals: CE, RoHS

Additional Information:

  • Item Code: SeriesBYDS
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