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Dwyer 616KX-200-200-IN Series 616KX Compact Differential Pressure Transmitter, +/-0.1 in WC (+/-25 Pa / +/-2.5 mm WC) Bidirectional, +/-2.0% FSO Accuracy, 4-20mA + Selectable Voltage Output, DIN Rail or Screw Mount, NEMA 1 IP20

Dwyer 616KX-200-200-IN Series 616KX Compact Differential Pressure Transmitter, +/-0.1 in WC (+/-25 Pa / +/-2.5 mm WC) Bidirectional, +/-2.0% FSO Accuracy, 4-20mA + Selectable Voltage Output, DIN Rail or Screw Mount, NEMA 1 IP20

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MSRP: $119.30
$95.00
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SKU:
616KX-200-200-IN
Condition:
New
Availability:
Not in Stock | Lead Time: 3 weeks
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Pressure Range+/-0.1 in WC (+/-25 Pa / +/-2.5 mm WC)
DirectionBidirectional
Accuracy+/-2.0% FSO
Output Signal4-20mA + 0-10/0-5/2-10/1-5V
MountingDIN Rail + Screw
EnclosureNEMA 1 / IP20, Plenum Rated
Compact Form1.8 oz / 51 g
Display UnitInches WC

The Dwyer Series 616KX 616KX-200-200-IN is a compact differential pressure transmitter designed for HVAC and BAS work where space, simplicity, and value matter - air handlers, duct pressure, variable air volume, and filter monitoring. This SKU is factory-calibrated to +/-0.1 in WC (+/-25 Pa / +/-2.5 mm WC) bidirectional at +/-2.0% FSO accuracy. Edge-mounted push-button zero is accessible from any mounting orientation, and the housing clips directly to 35 mm DIN rail (side or back) or screw-mounts through four front-face through-holes. Field-selectable voltage output (0-10 V / 0-5 V / 2-10 V / 1-5 V) plus the 4-20 mA current output handles low-pressure room, zone, and clean room differential applications.

Best for: OEM applications, small panel installations, and retrofit work where space and stocking depth matter. The compact 1.8 oz form factor plus the DIN-rail-or-screw mounting flexibility makes this the right pick when the spec calls for a basic, no-frills differential pressure transmitter - without the cost or footprint of a Magnesense Pro or universal-output unit. Pair with optional NPT or BSPT threaded process connections if your install uses pipe fittings rather than barbed tubing.
DWYER
WARRANTY
Manufacturer warranty backed by Dwyer. Coverage per Dwyer's standard Terms and Conditions of Sale (refer to the Dwyer catalog or workorder for current terms). ZOT Supply is an authorized Dwyer / DwyerOmega distributor; product ships factory-new with full manufacturer warranty intact and access to Dwyer technical support.

Key Features

Compact Design - Dwyer's Smallest DPT

At 1.8 oz (51 g) and roughly 2.4 x 2.4 x 1 in, the 616KX is Dwyer's smallest differential pressure transmitter. Designed for OEM applications and panel installs where space and value are key. Fits where larger transmitters can't.

+/-2.0% FSO Accuracy

Factory-calibrated to +/-2.0% FSO of full-scale output. The 616KX is offered in four accuracy tiers (0.25%, 0.5%, 1.0%, 2.0%) across the same range options - pick the accuracy tier that matches the application precision requirement and budget.

4-20 mA + Field-Selectable Voltage Output

Provides 4-20 mA current output AND field-selectable voltage output (0-10 V default, 0-5 V, 2-10 V, or 1-5 V) via DIP switches on the side of the unit. Simultaneous current + voltage output is also supported with a DC supply (10-36 VDC). One SKU handles multiple controller input types.

Edge-Mounted Push-Button Zero

Single zero pushbutton accessible from the edge of the housing - reachable in any mounting orientation without removing the unit. Apply zero pressure to both ports and hold the button for 3 seconds. Span is factory-calibrated; no user span adjustment required.

DIN Rail or Screw Mount

Housing accepts 35 mm DIN rail clips (side OR back orientation) for panel-density installations, OR screw mounting through four #6 through-holes on the front face. The DIN clip is removable - pull straight down and tilt to detach - so a single SKU covers both mounting methods.

Bidirectional Sensing

This SKU is the bidirectional variant: it measures pressure from -0.1 to +0.1 in WC (+/-25 Pa / +/-2.5 mm WC). Useful for applications where the differential can reverse direction - supply-vs-return imbalance, push-pull airflow, or any duct dP that may flip polarity.

Technical Specifications

SpecificationValue
Model616KX-200-200-IN
SeriesSeries 616KX
Pressure Range+/-0.1 in WC (+/-25 Pa / +/-2.5 mm WC)
DirectionBidirectional
Accuracy+/-2.0% FSO
Stability<= +/-1% FSO per year
Service / MediaAir and non-combustible, compatible gases
Output Signal4-20 mA AND field-selectable voltage (0-10 V default, 0-5 V, 2-10 V, or 1-5 V)
Simultaneous Current + Voltage OutputSupported with DC supply (10-36 VDC). Not supported with AC supply.
Power Requirements10-36 VDC (2-wire); 17-36 VDC or 21.6-33 VAC isolated (3-wire)
Current Consumption21 mA max continuous
Loop ResistanceCurrent: 0-1250 ohms max; Voltage: 1 kohm minimum load
Zero AdjustmentEdge-mounted push-button (3-second press)
Span AdjustmentFactory-calibrated, no user adjustment
Pressure Limits3.6 psig (operation)
Temperature Limits-4 to 158 F (-20 to 70 C)
Thermal Effect+/-0.02% FS per deg F (+/-0.036% FS per deg C)
Process ConnectionsDual-size barbed for 1/8 in, 3/16 in, 1/4 in, 5 mm, and 6 mm ID tubing
Optional Process Connections1/8 in female NPT or 1/8 in female BSPT threads
Electrical ConnectionsRemovable screw-type terminal block, 12-26 AWG
Mounting35 mm DIN rail (side or back clip) OR #6 screws through 4 front-face holes
Mounting OrientationVertical recommended (ports down). Sensor unaffected by orientation.
Display Unit (Factory Default)Inches WC
Enclosure RatingNEMA 1 (IP20); UL 2043 plenum-rated; UL94 V-0 flame-rated
Dimensions2.4 in W x 2.4 in H x 1 in D approx (61 x 61 x 26 mm)
Weight1.8 oz (51 g); user guide cites 5.0 oz with optional terminal cover
ComplianceCE, UKCA, RoHS 3, UL 2043 (plenum), UL94 V-0
ManufacturerDwyer Instruments, LLC (DwyerOmega)
Manufacturer Part Number616KX-200-200-IN

Documentation

PDFProduct Datasheet (DS-616KX Rev 6)PDFUser Guide (P-616KX)PDFQuick Start Guide

Frequently Asked Questions

What pressure range does the 616KX-200-200-IN measure?
This SKU is factory-calibrated to +/-0.1 in WC (+/-25 Pa / +/-2.5 mm WC) bidirectional. Span is set at the factory and is not user-adjustable - order the variant with the range you need rather than trying to re-span in the field. Zero, however, is field-adjustable via the edge-mounted push-button (hold for 3 seconds with no pressure applied to either port).
How do I change the voltage output range?
The 616KX ships from the factory in the 0-10 V setting. Use the two DIP switches on the side of the unit to select between four voltage output ranges: 0-10 V (both up, default), 0-5 V (DIP 1 up, DIP 2 down), 2-10 V (DIP 1 down, DIP 2 up), or 1-5 V (both down). The 4-20 mA current output is always available on the same unit. Power off the control system before changing DIP switches to avoid erratic behavior.
How do I wire the 616KX?
Four-position removable screw-type terminal block labeled VAC, VDC, COM, VOUT. For 4-20 mA current output: connect 10-36 VDC supply to VDC and the current receiver to COM (2-wire loop). For 3-wire voltage output: VDC + COM + VOUT with 17-36 VDC supply, OR VAC + COM + VOUT with 21.6-33 VAC isolated supply. For simultaneous current and voltage output: use VDC + COM + VOUT with separate wire leads joined only at the transmitter - and only with DC supply (not supported on AC). Always disconnect power before wiring.
What does +/-2.0% FSO accuracy mean and which tier should I pick?
This SKU is the +/-2.0% FSO accuracy tier. Full-scale output (FSO) accuracy means the output signal is within +/-2.0% FSO of the configured maximum range at all points across the range. The 616KX is offered in four tiers: 0.25%, 0.5%, 1.0%, and 2.0% FSO. The 0.25% tier suits critical applications (clean rooms, validated processes); 0.5% suits typical HVAC zone and duct work; 1.0% and 2.0% suit filter-loading trending and OEM applications where directional accuracy matters more than absolute precision. Stability across all tiers is at most +/-1% FSO per year.
How does the 616KX mount?
Two options on the same SKU. DIN rail mount: the housing accepts 35 mm DIN rail clips on either the side or back face of the unit. Pull the clip straight downward until it clicks to remove, then tilt and reinstall on the preferred face. Screw mount: four #6 through-holes on the front face accept screws for direct surface attachment. Dwyer recommends mounting with pressure ports facing down to prevent moisture ingress; the sensor itself is unaffected by orientation, but if you must mount with ports facing up, re-zero after install.
What tubing or pipe fittings does the 616KX accept?
Two dual-sized barbed connections labeled HIGH (+) and LOW (-), accepting 1/8 in, 3/16 in, 1/4 in, 5 mm, and 6 mm ID flexible tubing - rubber or vinyl. The base SKU uses these barbs. If your installation uses NPT or BSPT pipe fittings instead, Dwyer offers -NPT (1/8 in female NPT) and -BSPT (1/8 in female BSPT) variant suffixes. When using threaded models, apply thread sealant, don't over-torque, and don't exceed 6 turns of engagement. Long tubing runs are fine but will increase response time slightly.
Brand:
Dwyer
Manufacturer:
Dwyer Instruments LLC (DwyerOmega)
Series:
Series 616KX
Product Type:
Compact Differential Pressure Transmitter
Pressure Range:
+/-0.1 in WC (+/-25 Pa / +/-2.5 mm WC)
Direction:
Bidirectional
Accuracy:
+/-2.0% FSO
Output Signal:
4-20 mA + Selectable Voltage (0-10/0-5/2-10/1-5 V)
Mounting:
35 mm DIN Rail or Screw Mount
Enclosure Rating:
NEMA 1 (IP20), UL 2043 Plenum, UL94 V-0
Display Unit Factory Default:
Inches WC
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