www.hvac.vn pressure transmitters and switches the materials included in this compilation are for...
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Pressure Transmitters and Switches
The materials included in this compilation are for the use of Dwyer Instruments, Inc. potential customers and current employees as a resource only. They may not be reproduced, published, or transmitted electronically for commercial purposes. Furthermore, the Company’s name, likeness, product names, and logos, included within these compilations may not be used without specific,
written prior permission from Dwyer Instruments, Inc. ©Copyright 2014 Dwyer Instruments, Inc.
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Overview
MS2 – Diff. Pressure Transmitter
616 – Diff. Pressure Transmitter
629 – Wet/Wet Diff. Pressure Transmitter
DX – Wet/Wet Diff. Pressure Switch
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MS2 - Introduction
Differential pressure transmitterUses the Hall Effect sensing technology of the original Series MSMonitors Pressure, Air Velocity and Air FlowUses BACnet/Modbus Communications
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MS2 - Key Specifications
Service: Air and non-combustible, compatible gasesTypical Accuracy:
±1% FS for 0.25˝ (50 Pa), 0.5˝ (100 Pa), 2˝ (500 Pa), 5˝ (1250 Pa), 10˝ (2 kPa), 15˝ (3 kPa), 25˝ (5 kPa)±2% FS for 0.1˝ (25 Pa), 1˝ (250 Pa), and all bi-directional ranges
Pressure Limits: 1 psi max., operation; 10 psi burst
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MS2 - Key Specifications
Output Signals: 4 to 20 mA (2-wire), 0 to 5 VDC, 0 to 10 VDC (3-wire)Enclosure Rating: IP66Mounting Orientation: Diaphragm in vertical positionAgency Approvals: BTL, CE
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MS2 - Technology
Uses Hall Effect sensing technologyUses magnetic sensing to detect pressureReliable long term performance
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MS2 - Features
Multiple field selectable rangesCan be used for a variety of applicationsDon’t need to buy multiple models
Both English and Metric units can be selectedCan choose between voltage or current settings
Can be used with many different systems
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MS2 - Features
Modbus and BACnet availableTransmitters can be daisy chainedMS2 can be easily integrated into the rest of your BAS
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MS2 - Applications
Duct static pressureFan proving
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616- Introduction
Differential pressure transmitterComes in several factory calibrated rangesSpan and Zero controls included for fine tuning and minor re-calibration in the fieldPurchase by differential pressure ranges
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616 - Key Specifications
Service: Air and non-combustible, compatible gasesAccuracy: ±0.25% FSOutput Signal: 4 to 20 mAZero and Span Adjustments: Potentiometers for zero and spanAgency Approval: CE
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616 - Features
Compact housingIdeal for VAV systems
Fine tuning and minor recalibration in the field
Easy maintenanceMore accurate for a longer time
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616 - Applications
Variable air volume systemsFan speeds are adjusted based on pressure in ductsCan be used to check on status of air filters
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629 - Introduction
Monitors differential pressure of air and compatible gases and liquidsSmall internal volume and minimum moving parts result in exceptional response and reliabilityDesigned to meet NEMA 4X (IP66) construction3-way valve option available
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629 - Key Specifications
Service: Compatible gases & liquidsWetted Materials:
Without valve: 316, 316L SSAdditional wetted parts with 3-way valve option: Buna-N, silicone grease, PTFE, brass 360, copper, reinforced acetal copolymer
Accuracy: ±0.5% FS (includes linearity, hysteresis & repeatability)
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629 - Key Specifications
Enclosure Rating: Designed to meet NEMA 4X (IP66)Agency Approvals: CEOutput Signal: 4 to 20 mA. Optional 0 to 5, 0 to 10 VDC
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629 - Features
Small internal volume and minimum moving parts
Exceptional response and reliabilityMinimal wear and tear
Terminal block, zero and span adjustments easily accessible
Easy maintenance and recalibration
3-way valve option available
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629 - Applications
Monitor differential pressures across:
Flow elementsHeat exchangersFiltersPumpsCoils
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DX - Introduction
Differential Pressure Switch for waterGives us a low cost product to round out product offering as an alternative to the H3 and DP
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DX - Key Specifications
Temperature Limits: -1 to 60 C Enclosure Rating: IP66Maximum Pressure: 13.8 barRepeatability: 2% of full rangeProcess Connection: 1/4” – 18 NPT FemaleWetted Materials: Brass and Viton (Option for Buna N)
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DX - Key Specifications
Switch Type: SPDT snap switch Electrical Rating: 5A @ 125 VAC, 3A @ 250 VAC, 4A @ 30 VDCElectrical Connection: Removable terminal blockConduit Connection: Hole for conduit hub, optional cable gland
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DX - Key Specifications
Agency Approvals: UL508, ULc, CESet Point Adjustment: External, hand adjustable hex head screwMounting Orientation: Vertical, 10
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DX - Ranges
Adjustable Range
bar
Fixed Deadband bar
0.17 to 0.69 0.10 to 0.17
0.69 to 1.72 0.17 to 0.24
1.38 to 3.45 0.24 to 0.41
3.46 to 5.17 0.41 to 0.55
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DX - Features
Pipe or flush mount with provided mounting earsWeatherproof constructionHigh static pressure ratingTight deadbandExternal set point adjustment
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DX - Applications
Water FiltrationUsed to initiate backwash of the filter. These can be bag filters, sand filters, and disc filters. Starts on increase of differential pressure. Filters are varied in application from irrigation systems to cooling towers.
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DX - Applications
Coolant FiltersUsed to initiate backwash of filter. Starts on increase of differential pressure. These are filters used to clean the coolant used on machining systems. Cleans out the metal bits from the coolant.
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DX – Application: BAS
ChillersProves flow of liquid from pump through the chiller. Often called evaporator water pressure drop.
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DX – Application: Chiller
All Trane units are pre-packaged with a vane flow switch. The majority of integrators and installers feel these are problematic and throw them away and use a DP switch or current switch.Trane variable flow pump units tend to use DP switches as a current switch doesn’t work as well on variable speed driven pumps.
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DX – Application: BAS
AC Units or Heat PumpsUsed in buildings on the condenser water loop that goes between the cooling tower on the roof to the AC unit in a particular zone in a building. Usually each floor has one AC unit. Used in all high-rises.
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DX – Application: BAS
AC Units or Heat PumpsOften called a “Condenser Water Lock-Out Switch”. AC unit will freeze up if no flow through it.Heat Pump Manufacturers: Climate Master, Aon, Mammoth, Carrier, etc.
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DX – Application: BAS
Key for BAS applications is the low set point. They are trip on a decrease of DP, so the unit can be set to .035 bar.Also key is tight deadband for early reset on increase of pressure.
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DX - Application
General IndustryPump flow proving with DP across the pump.Flow proving with a flow element such as a venturi or an orifice plate.