Flow Measurement Made Easy

Mid-West Instrument has the right Flow Scale for You

  • From DP Gauge to Flow Measurement
  • Easy to read dials
  • Body materials of Aluminum, Brass, Stainless Steel, and more depending on model selected
  • Models 105, 106, 109, 130, 140 & 142
  • With or without switch / transmitter
  • GPM, ACFM, SCFM, LBS/HR and more.

Flow measurement using Mid-West Instrument differential pressure gauge technology will provide accuracy and reliability you’ve come to know and trust. Our industrial quality differential pressure flow gauge uses modern materials and current technology to provide an easy to read flow scale.

Mid-West differential pressure flow gauges indicate such flow rates as liters per minute up to gallons per hour, even when used at high line pressures. Units can be supplied with reed switches or relays to initiate alarms, activate other equipment, or shut the system down. Two switches are available when high and low limits are required.

4-20 mA Transmitter also available please contact a sales coordinator for more information.

Here are some typical flow designators: GPM, USGPM, ACFM, SCFM, NM3/HR, LBS/HR, L/MIN, L/SEC, KG/HR, TONS/HR.

NOTE: Models 105, 106 and 109 Flow scales are available with 1% Full Scale accuracy only.

Model No. Differential Pressure Range Accuracy Working Pressure Electrical Available Specifications Installation/ Operation Manual Electrical IOM Drawing
Model 105 0-10" H2O (0-0.4 PSID) to 0-79.9" H2O (0-2.9 PSID) ±1/2% or 1%
Note:
1/2% Full Scale available 30" H2O & above
Up to 6,000 PSI LOCKED LOGIC SWITCHES
NEMA 4X, Class I Division I, GROUP. B, C & D, Class II Division I, GROUP. E, F & G
Model 106 0-80" H2O (0-3 PSID) to 0-800" H2O (0-30 PSID) ±1/2 or ±1% Up to 6,000 PSI LOCKED LOGIC SWITCHES
NEMA 4X, Class I Division I, GROUP. B, C & D, Class II Division I, GROUP. E, F & G
MICRO SWITCHES
0-80" H2O to 0-800" H2O, CSA LISTED IND. CONT. EQUIP.
Model 109 0-15 PSID to 0-6000 PSID (Dependent on Body Material and Safe working Pressure) 1/2% or 1% Full Scale
(1/2% Not available above 1,000 PSID or Bi-Directional Ranges)
NOTE:
Bi-Directional Accuracy is 1% Total Span
±3% Total Span
(For Ranges above 1,500-0-1,500 PSID)
Up to 6,000 PSI LOCKED LOGIC SWITCHES
Weather-proof Housing, NEMA 4X, Class I Division I, GROUP. B, C & D, Class II Division I, GROUP. E, F & G

Available Flow Scale Models: 105, 106, & 109

Uni-Directional Dial Ranges are available in either LINEAR or SQUARE ROOT FLOW SCALES with any appropriate legend (I.E. GPM, SCFM, USGPM, NM3/HR, L/MIN, ETC) at no extra charge

0-0.50-300-300
0-1.00-350-400
0-1.60-400-500
0-2.00-500-600
0-3.00-600-700
0-4.00-700-800
0-5.00-750-900
0-6.00-800-1000
0-7.00-1000-1500
0-8.00-1350-1600
0-100-1500-2000
0-150-1600-3000
0-200-2000-4000
0-250-2500-5000
0-6000
Model No. Differential Pressure Range Accuracy Working Pressure Electrical Available Specifications Installation/ Operation Manual Electrical IOM Drawing
Model 130 0-5" H2O to 0-15 PSID (0-400" H2O) 0-5" H2O to 0-9.9" H2O
±5%
0-10" H2O to 0-15 PSID
±3/2/3%
Up to 500 PSI CE / LVD, RoHS Compliant, NEMA 4X, Class 1-Div. 1
Model 140 0-50" H2O to 0-100 PSID 0-50" H2O to 0-399" H2O
±5%
0-15 PSID to 0-100 PSID
±3/2/3%
Up to 3,000 PSI CE / LVD, RoHS Compliant, NEMA 4X, Terminal Strip, Class 1-Div. 1, Class 1-Div. 2, 4-20mA Transmitter N/A
Model 142 0-20" H2O to 0-25 PSID ±3/2/3% Up to 3,000 PSI CE / LVD, RoHS Compliant, NEMA 4X, Terminal Strip, Class 1-Div. 2, 4-20mA Transmitter

Available Flow Scale Models: 130, 140, 142

Uni-Directional Dial Ranges are available in either LINEAR or SQUARE ROOT FLOW SCALES with any appropriate legend (I.E.GPM, SCFM, USGPM, NM3/HR, L/MIN, ETC) at no extra charge

Model 130 Flow DialsModel 140/142 Flow Dials
0-1.00-1.0
0-1.250-1.5
0-1.50-2.0
0-1.750-2.5
0-2.00-5.0
0-2.50-7.5
0-3.00-10.0
0.35
0-4.0
0.4.5
0-5.0
0-5.5
0-6.0
0-6.5
0-7.0
0-7.5
0-8.0
0-8.5
0-9.0
0-9.5
0-10
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