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.

Overview MS2 – Diff. Pressure Transmitter 616 – Diff. Pressure Transmitter 629 – Wet/Wet Diff. Pressure Transmitter DX – Wet/Wet Diff. Pressure Switch

MS2 - Introduction Differential pressure transmitter Uses the Hall Effect sensing technology of the original Series MS Monitors Pressure, Air Velocity and Air Flow Uses BACnet/Modbus Communications

MS2 - Key Specifications Service: Air and non-combustible, compatible gases Typical 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

MS2 - Key Specifications Output Signals: 4 to 20 mA (2-wire), 0 to 5 VDC, 0 to 10 VDC (3-wire) Enclosure Rating: IP66 Mounting Orientation: Diaphragm in vertical position Agency Approvals: BTL, CE

MS2 - Technology Uses Hall Effect sensing technology Uses magnetic sensing to detect pressure Reliable long term performance

MS2 - Features Multiple field selectable ranges Can be used for a variety of applications Don’t need to buy multiple models Both English and Metric units can be selected Can choose between voltage or current settings Can be used with many different systems

MS2 - Features Modbus and BACnet available Transmitters can be daisy chained MS2 can be easily integrated into the rest of your BAS

MS2 - Applications Duct static pressure Fan proving

Introduction Differential pressure transmitter Comes in several factory calibrated ranges Span and Zero controls included for fine tuning and minor re-calibration in the field Purchase by differential pressure ranges

Key Specifications Service: Air and non-combustible, compatible gases Accuracy: ±0.25% FS Output Signal: 4 to 20 mA Zero and Span Adjustments: Potentiometers for zero and span Agency Approval: CE

Features Compact housing Ideal for VAV systems Fine tuning and minor recalibration in the field Easy maintenance More accurate for a longer time

Applications Variable air volume systems Fan speeds are adjusted based on pressure in ducts Can be used to check on status of air filters

Introduction Monitors differential pressure of air and compatible gases and liquids Small internal volume and minimum moving parts result in exceptional response and reliability Designed to meet NEMA 4X (IP66) construction 3-way valve option available

Key Specifications Service: Compatible gases & liquids Wetted Materials: Without valve: 316, 316L SS Additional 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)

Key Specifications Enclosure Rating: Designed to meet NEMA 4X (IP66) Agency Approvals: CE Output Signal: 4 to 20 mA. Optional 0 to 5, 0 to 10 VDC

Features Small internal volume and minimum moving parts Exceptional response and reliability Minimal wear and tear Terminal block, zero and span adjustments easily accessible Easy maintenance and recalibration 3-way valve option available

Applications Monitor differential pressures across: Flow elements Heat exchangers Filters Pumps Coils

DX - Introduction Differential Pressure Switch for water Gives us a low cost product to round out product offering as an alternative to the H3 and DP

DX - Key Specifications Temperature Limits: -1 to 60  C Enclosure Rating: IP66 Maximum Pressure: 13.8 bar Repeatability:  2% of full range Process Connection: 1/4” – 18 NPT Female Wetted Materials: Brass and Viton (Option for Buna N)

DX - Key Specifications Switch Type: SPDT snap switch Electrical Rating: 125 VAC, 250 VAC, 30 VDC Electrical Connection: Removable terminal block Conduit Connection: Hole for conduit hub, optional cable gland

DX - Key Specifications Agency Approvals: UL508, ULc, CE Set Point Adjustment: External, hand adjustable hex head screw Mounting Orientation: Vertical,  10 

DX - Ranges

DX - Features Pipe or flush mount with provided mounting ears Weatherproof construction High static pressure rating Tight deadband External set point adjustment

DX - Applications Water Filtration Used 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.

DX - Applications Coolant Filters Used 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.

DX – Application: BAS Chillers Proves flow of liquid from pump through the chiller. Often called evaporator water pressure drop.

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.

DX – Application: BAS AC Units or Heat Pumps Used 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.

DX – Application: BAS AC Units or Heat Pumps Often 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.

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.

DX - Application General Industry Pump flow proving with DP across the pump. Flow proving with a flow element such as a venturi or an orifice plate.