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Dwyer
Series 604D Minihelic® Indicating Transmitter combines
visual monitoring with electronic control of low differential air
or compatible gas pressures. This versatile device is ideal for
building HVAC systems where local indication is needed during the
maintenance checks or when troubleshooting the system. The transmitter
design employs the latest silicon strain gage technology and operates
in 2, 3 or 4 wire control loop circuits. Separate Zero and Span
controls plus a 4-screw terminal strip are protected in a gasketed
side enclosure. Cable gland fits .10 - .25" round cable. A 13-35
VDC or 18-26 VAC (4-wire only) power supply is required.
PHYSICAL
DATA
GENERAL
Maximum Pressure: 30 PSIG (207 kPa) continuous, 50 psig (344
kPa) surge
Media Compatibility: Air and non-combustible, non-corrosive
gases
Materials: Mineral and glass filled nylon housing, high impact
acrylic cover, silicone rubber diaphragm.
ELECTRICAL
Power Supply: 13-35 VDC - 2, 3 or 4 wire, 18-26 VAC - 4 wire
Output Signal: 4-20 mA DC (limited at 38 mA DC)
Loop Resistance: DC, 0-1100 ohms, AC- 0-1100 ohms; AC, 0-1130
ohms
Warm-up Time: 10 minutes
PERFORMANCE AT 70°F (21.1°C)
Zero Output: 4 mA DC
Full Span Output: 20 mA DC
Span: 16 mA DC
Accuracy, Gage: ±5% of full span output
Accuracy, Transmitter: ±2% of full span output (Includes
linearity, hysteresis and repeatability)
Stability: ±1% F.S.O/year
ENVIRONMENTAL
Operating Temperature: 20 to 120°F (-6.7 to 49°C)
Thermal Error: ±1% per 50°F
MECHANICAL
Weight: 8 oz. (227 grams)
Span and Zero Controls: Internally accessible potentiometers
Pressure Connections: Barbed, for 3/16" (4-5
mm) I.D. tubing
Standard Accessories: Two #10 x 1" pan head sheet metal screws,
one .050 hex allen wrench
STOCKED
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