ISTEC Corporation, your Flow Measurement and Control Specialist
 

ISTEC CORPORATION
Flow Measurement & Control
5 Park Lake Road, Unit 6
Sparta, NJ 07871 USA
Tel 973-383-9888
Fax 973-383-9088
Email


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Model 250 Metris Gas Meter

 Model 250 Metris Gas Meter The Metris Meter is uniquely constructed to give utilities the edge they need in an increasingly complex and competitive marketplace. The Metris offers three versions that provide greater flexibility for your metering needs. The unique modular design of the Metris offers the advantage of complete customization to fit individual installation needs. In addition, due to inventory and manufacturing enhancements provided by modularity, this invaluable flexibility can also be delivered with unparalleled speed and scheduling dependability.

COMPACT SIZE

While the Metris is more compact than traditional meters, it was also designed to meet customer expectations to be returned to the field after meter sampling or meter change-outs. The Metris is also rated at a full 250 CFH. The square base of the Metris and its 33% reduction in weight provide for stability and reduced shipping costs.

Regulator/Manifold
AMR Compatibility
Measurement Module
Die Cast Housing
Regulator/Manifold
AMR Compatibility
Measurement Module
Die-cast Housing




  • B42R Pressure Regulator
  • Pressure Taps - Regulator inlet, Regulator Outlet, & Meter Outlet
  • Cast Iron Manifold for Installation Strength
  • Field Replaceable Regulator Diaphragm Case
  • Slant Face Sprague Meter Mounting Design
  • Compatible with All AMR Manufacturers
  • Common Between All 3 Versions
  • Seamless Single Convolution Diaphragm
  • Lubrication-free Bearing Surfaces
  • Direct Diaphragm Support
  • Remanufacture Meters in Record Time
  • Lifetime Warranty
  • Bottom Case Common Between All 3 Versions

FEATURES

  • Modular Design
  • Built-in Pressure Taps (RM)
  • Lubrication Free Bearing Surfaces
  • 4-chamber Design
  • AMR Compatible
  • Top Entry Adjustment
  • Tamper Resistant Design
  • Common Measurement Module
  • 5/16" 4 Nut Adjustment Mechanism

BENEFITS

  • Compact Size
  • Better overall aesthetics
  • Fewer potential leak points
  • Easy handling
  • Simplified service/repair
  • Flexible piping configurations
  • Long life
  • Maintenance free operation
  • Cost effective temperature compensation
PART
MATERIAL


Center Module and Side Covers
Acetal
Cam Crank
Acetal
Flags, Flag Arms & Arm Links
Acetal
Valve Links
Acetal
Retaining Clip, Valve Cover Guides & Gear Shaft
Acetal
Tangent Plate
Die-cast Aluminum
Index Cover
Polycarbonate (Lexan)
IDM Seal
Acetal
IDM Boot
Nitrile
Valve Seat & Covers
Thermoset Phenolic
Diaphragm Plates
Acetal
IDM Shaft, Center Shaft & Flag Shaft
Stainless Steel
Diaphragm Disks
Tin-plated Steel
O-Rings
Nitrile
Outlet Seal
Nitrile
Case Gasket
Cork/Neoprene
Index Gears
Acetal
Index Face Plate
ABS
Top & Bottom Castings
Die-cast Aluminum
Handhole Cover
Stamped Aluminum
Regulator
Die-cast Aluminum (Metris RM only)
RM Manifold
Cast Iron (Metris RM only)
MB Plate
Steel (Metris MB only)


Meter Classification
Metris 250
Metris RM
Metris MB


Meter Capacity
250 CFH Natural Gas @ 0.5 inch H2O differential
400 CFH Natural Gas @ 1.0 inch H2O differential


Meter Type
(TC) Temperature Compensated or
(NTC) Non-temperature Compensated


Index
4 Circle Dial (ft3 - Standard Pressure, 14 inch H2O, 2 PSIG)
4 Digit Direct Read (ft3 - Standard Pressure)
5 Digit Direct Read (ft3 or m3 - Standard Pressure)
ft3 - 1/2' and 2' proving dial
m3 - 10dm3 and 50dm3 proving dial
Standard = 7 inch H2O @ 14.73 PSIA base/14.4 PSIA atmospheric


Meter M.A.O.P.
5 PSIG


Regulator M.A.O.P.
N/A
125 PSIG
N/A


Hub Sizes
#1 Sprague Standard, 10 LT, 20 LT, 30 LT, 1-1/4"


Inlet Connection
N/A
3/4" or 1" Female NPT


Surface Treatment
ASA 49 Gray Polyester Powder Coating


Packaging
75 Pack/Skid
N/A
N/A

MEASUREMENT INFORMATION

Units
Imperial (cubic feet - ft3)
Metric (cubic meters - m3)


Index Drive
2 Cubic Feet/Revolution
50 Cubic Decimeters/Revolution


Tangent Crank
14 Revolutions/Cubic Feet
0.5 Revolutions/Cubic Decimeter
or
0.071 Cubic Feet/Revolution
2 Liters/Revolution

CORRECTION FACTORS FOR NON-NATURAL GAS APPLICATIONS

The Metris may be used to control materials other than natural gas. To determine the capacity of the Metris for gases other than natural gas, it will be necessary to multiply the values within the capacity tables by a correction factor. The following table lists the correction factors for some of the more common gases...

Gas Type
Specific Gravity Correction Factor (CF)



Air
1.00
1.00

Argon
1.38
.85

Dry Carbon Dioxide
1.52
.81

Ethane
1.04
.98

Helium
.14
1.49

Hydrogen
.07
1.02

Krypton
2.82
.59

Methane (pure)
.55
1.35

Natural Gas
.60
1.29

Neon
.70
1.20

Nitrogen
.97
1.02

Propane
1.53
.81

Xenon
4.53
.47

To calculate the correction factor for gases not listed on the table above, it will be necessary to know the specific gravity of the gas and use it in the formula... Correction Factor Formula

Where...

SG1 = Specific Gravity of the gas in which the capacity is published.
SG2 = Specific Gravity of the gas to be controlled.


 
Metris 250
 
A
7.7"
(195mm)


B
11.3"
(287mm)


C
6.0"
(152mm)


D
8.8"
(223mm)


E
6.0"
(152mm)


F
9.1"
(231mm)


G
 


H
 


I
 


J
 


K
 


Wt (lbs)
8 lbs
(3.6 kg)


Metris 250
Metris 250 Dimensional Drawing

Download PDF VersionDownload Installation Manual