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

See the Latest

FreeFlow Newsletter from ISTEC

Newsletter Sign-up Here

Request

Ask for ISTEC’s Catalog on Disc

ISTEC’s Catalog on Disc

OFFICE HOURS

Monday thru Friday
8:00am to 5:00pm
Eastern

We Accept

We Accept MasterCard, Visa and American Express

Last Update:

Dattus Model fM Commercial & Industrial Gas Meters

 Dattus Model fM2 Commercial & Industrial Gas MeterThe Dattus fM Meter is suited for commercial to light industrial gas measurement applications up to flow rates of 56,000 actual cubic feet per hour (acfh). With no moving parts, the Dattus Meter is ideal for applications where continuous gas flow to the customer is required. The Dattus Meter will not cause an interruption of gas service, which may be important for customers such as hospitals, nursing homes, schools, or factories using processes requiring uninterrupted gas flow.

The operation of the Dattus Meter, see diagram on following page, is based on the fluidic oscillation principle. The measurement unit is comprised of three functional elements...

  • Flow Conditioner
  • Jet Nozzle Formation
  • Fluidic Oscillator Chamber

Gas enters (1) the meter and divides into two separate flow paths (2) these two flows recombine (3) as they exit the flow conditioner and enter the fluidic oscillation chamber through the nozzle. The process of dividing the flows eliminates upstream disturbances and creates well-conditional flow. In the fluidic oscillation chamber, a jet is formed (4) as the gas enters through the nozzle. The jet then starts oscillating back and forth (5).

Thermal sensors, located just after the nozzle, detect a temperature variance as the gas jet passes from one side to the other. The volume of gas passed through the meter is obtained by counting the number of oscillations detected by the sensors.

The basic meter performs volume metering based on the gas pressure and temperature in the meter. In addition to the standard functionality of the basic configuration, we offer some options for your consideration.

Standard Features Optional Features
  • Compact Design
  • Configurable Index Orientation
  • Instant Flow Rate Display
  • Nominal 7-10 Years Battery Life
  • Pressure Up to 150 psi
  • Capacity Up to 9,000 cfh (base rating)
  • Large Rangeability
  • Maintenance-free Operation
  • Two-Channel Programmable Pulse Outputs
  • Will Not Bind
  • No Oil Required
  • No Leveling Required
  • Highly Accurate Measurement
  • Gas Volume Totaling
  • Fixed Factor Correction
  • Non-volatile Memory for Storing Values and Data
  • Optical Communication Port for Reading/Writing of Values
  • Eight Item Programmable Display
  • Magnetic Switch to Change Display Values
  • Temperature Correction Using a Temperature Probe Mounted in the Gas Flow
  • Fixed Pressure Correction
  • Full Live Pressure and Temperature Correction and Data Logging with Integral Gas Micro EVC
Meter Pressure (PSIG)
1
5
25
60
90
100
150
MSCFH
9.6
12.0
24.3
45.7
64.0
70.1
100.6

Internal View of Dattus Model fM2 Commercial & Industrial Gas Meter

METER SPECIFICATIONS – fM2

Dattus fM
Flange Size
Units
fM2
1M
fM2
1.5M
fM2
2M
fM2
3M
fM2
5M
fM2
7M
fM2
11M
Rated Capacity
–
acfh (m2)
1000 (28.3)
1500 (42.5)
2000 (56.6)
3000 (85.0)
5000 (141.6)
7000 (198.2)
11000 (311.5)
Maximum Capacity1
–
acfh (m2)
1250 (35.4)
1875 (53.1)
2500 (70/8)
3750 (106.2)
6250 (177.0)
8750 (247.8)
13750 (389.4)
MAOP
–
psig (bar)
150 (10.3)
150 (10.3)
150 (10.3)
150 (10.3)
150 (10.3)
150 (10.3)
150 (10.3)
Dynamic Range ±1%
–
ratio
17:1
25:1
33:1
50:1
83:1
116:1
183:1
Dynamic Range ±2%
–
ratio
45:1
68:1
98:1
136:1
227:1
318:1
500:1
Flow Rate 0.5" w.c. (1.24mbar) Gas
2" FL
acfh (m2)
2
2
2
2457 (69.6)
2457 (69.6)
2457 (69.6)
2457 (69.6)
3" FL
acfh (m2)
2
2
2
2750 (77.9)
2750 (77.9)
2750 (77.9)
2750 (77.9)
Flow Rate 1.0" w.c. (2.49mbar) Gas
2" FL
acfh (m2)
2
2
2
2
3481 (98.6)
3481 (98.6)
3481 (98.6)
3" FL
acfh (m2)
2
2
2
2
3871 (109.6)
3871 (109.6)
3871 (109.6)
Flow Rate 2.0" w.c. (4.98mbar) Gas
2" FL
acfh (m2)
2
2
2
2
4918 (139)
4918 (139)
4918 (139)
3" FL
acfh (m2)
2
2
2
2
5535 (157)
5535 (157)
5535 (157)
Pressure Drop at Rated Capacity
2" FL
in. w.c. (mbar)
0.09 (0.22)
0.19 (0.47)
0.33 (0.82)
0.75 (1.87)
2.06 (5.1)
3.89 (9.7)
9.25 (23)
3" FL
in. w.c. (mbar)
0.05 (0.12)
0.14 (0.35)
0.26 (0.65)
0.61 (1.52)
1.64 (4.1)
3.14 (7.8)
7.55 (18.8)
Flange Connection Size
–
inches
2" or 3"
2" or 3"
2" or 3"
2" or 3"
2" or 3"
2" or 3"
2" or 3"
Flange-to-Flange Dimensions
–
inches
6-3/4
6-3/4
6-3/4
6-3/4
6-3/4
6-3/4
6-3/4
Weight
–
lbs (kg)
37 (16.8)
37 (16.8)
37 (16.8)
37 (16.8)
37 (16.8)
37 (16.8)
37 (16.8)
Shipping Weight
–
lbs (kg)
42 (19.1)
42 (19.1)
42 (19.1)
42 (19.1)
42 (19.1)
42 (19.1)
42 (19.1)
1 The Dattus fM2 may be run up to 25% over its rated capacity and still maintain accurate measurement
2 Flow rate at stated pressure drop is higher than the rated capacity of meter

METER SPECIFICATIONS – fM3

Dattus fM
Units
fM3
7M
fM3
11M
fM3
16M
fM3
23M
fM3
38M
fM3
56M
Rated Capacity
acfh (m2)
7,000 (198.2)
11,000 (311.5)
16,000 (453)
23,000 (651.3)
38,000 (1076)
56,000 (1585)
Maximum Capacity1
acfh (m2)
8750 (247.8)
13,750 (389.4)
20,000 (566.3)
28,750 (814.1)
47,500 (1345)
57,000 (1614)
MAOP
psig (bar)
175 (12.1)
175 (12.1)
175 (12.1)
175 (12.1)
175 (12.1)
175 (12.1)
Dynamic Range ±1%
ratio
70:1
110:1
160:1
230:1
380:1
560:1
Dynamic Range ±2%
ratio
117:1
183:1
267:1
383:1
633:1
933:1
Flow Rate 0.5" w.c. (1.24mbar) Gas
acfh (m2)
6650 (188)
6650 (188)
6650 (188)
6650 (188)
6650 (188)
6650 (188)
Flow Rate 1.0" w.c. (2.49mbar) Gas
acfh (m2)
2
9350 (265)
9350 (265)
9350 (265)
9350 (265)
9350 (265)
Flow Rate 2.0" w.c. (4.98mbar) Gas
acfh (m2)
2
2
13,150 (372)
13,150 (372)
13,150 (372)
13,150 (372)
Pressure Drop at Rated Capacity
in. w.c. (mbar)
0.55 (1.37)
1.39 (3.46)
2.98 (7.4)
6.18 (15.4)
17.37 (43)
37.73 (94)
Flange Connection Size
inches
4"
4"
4"
4"
4"
4"
Flange-to-Flange Dimensions
inches
9-1/2
9-1/2
9-1/2
9-1/2
9-1/2
9-1/2
Weight
lbs (kg)
114 (51.7)
114 (51.7)
114 (51.7)
114 (51.7)
114 (51.7)
114 (51.7)
Shipping Weight
lbs (kg)
128 (58.1)
128 (58.1)
128 (58.1)
128 (58.1)
128 (58.1)
128 (58.1)
1 The Dattus fM2 may be run up to 25% over its rated capacity and still maintain accurate measurement, except for the 56M which has a maximum of 57,000 acfh (1614 m3h)
2 Flow rate at stated pressure drop is higher than the rated capacity of meter
A
B
C
D
Thread Depth
16.5"
10.6"
6.75"
10.0"
1.00"
Flange Type
Bold Pattern
ANSI 125 2"
4.75"
ANSI 125 3"
6.00"
Flanges receive four 1-3/4" x 5/8" - 11 UNC 2B Bolts
Dimensional Drawing for Dattus Model fM2 Commercial & Industrial Gas Meter
RANGEABILITY
Dynamic Range
400:1
Minimum Flow Rate
22 acfh
Maximum Flow Rate
9,000 acfh
PULSE OUTPUT
Pulse Type Low-frequency
Form Type A
Pulse Duration 250 ms
Pulse Value User Scalable
TEMPERATURE PROBE
Type
PT1000, Platinum Resistance Thermistor (RTD)
Typical Accuracy
0.1% of Absolute Measurement

DATTUS ACCURACY & ROTARY METER COMPARISON

Dattus Accuracy & Rotary Meter Comparison

PRESSURE DROP, GAS (0.6 Specific Gravity) @ATMOSPHERIC CONDITIONS

Dattus
Model
Flange
Version
Flow Rate
(acfn)
Pressure Drop
(gas (in w.c.)
Dynamic Range
±2%
Dynamic Range
±1%
fM2
2"
9000
6.38
409:1
150:1
7968
5.00
362:1
133:1
7000
3.89
318:1
116:1
5000
2.06
227:1
83:1
4918
2.00
225:1
82:1
3481
1.00
158:1
58:1
3000
0.75
136:1
50:1
2457
0.50
112:1
41:1
3"
9000
5.06
409:1
150:1
8905
5.00
405:1
148:1
7000
3.14
318:1
116:1
5535
2.00
252:1
92:1
5000
1.64
227:1
83:1
3871
1.00
176:1
65:1
3000
0.61
136:1
50:1
2750
0.50
125:1
46:1

PRESSURE DROP (2" and 3" Version)

Pressure Drop (2" and 3" Version)

Download PDF Version • Download Installation Manual