Aalborg GFM - Manual (Page 11)

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Power input is protected by a 750 mA (GFM models with serial numbers below 340621-1)
or 300 mA (GFM models with serial numbers above 340621-1) M (medium time-lag) reset-
table fuse, and a rectifier diode for polarity protection.
WETTED MATERIALS:
GFM17/37/47/57/67/77: Anodized aluminum, brass, and 316 stainless steel with
VITON
7 O-rings seals; BUNA7, EPR or KALREZ7 O-rings are optional.
GFM17S/37S/47S/57S/67S/77S: 316 stainless steel with VITON
7 O-rings seals; BUNA7,
EPR or KALREZ
7 O-rings are optional.
Aalborg
7
makes no expressed or implied guarantees of corrosion resistance of mass flow
meters as pertains to different flow media reacting with components of meters. It is the
customers' sole responsibility to select the model suitable for a particular gas based on the
fluid contacting (wetted) materials offered in the different models.
INLET AND OUTLET CONNECTIONS:
GFM 17 and 37: 1/4" compression fittings. Optional: 6mm compression, 1/4" VCR
7 ,
3/8" or 1/8" compression fittings (GFM 17).
GFM 47: 3/8" compression fittings.
GFM 57: 3/8" compression fittings.
GFM 67: 1/2" compression fittings.
GFM 77: 3/4" FNPT fittings or 3/4" compression fittings.
LCD DISPLAY: 3½ digit LCD (maximum viewable digits “1999”), 0.5 inch high characters.
On GFM171/371/471/571/671/771 aluminum or stainless steel models the LCD display is
built into the upper block element and may be tilted over 90 degrees for optimal viewing
comfort. Remote or panel mounting remote reading is optional.
Standard readings are in direct engineering units for the given gas and flow rate (i.e.
liters/minute [slpm], standard cubic centimeters/minute [sccm], standard cubic feet/hour
[scfh], etc.). 0 to 100% LCD calibration scaling is available upon request at time of order.
Contact your distributor or Aalborg
7 when non-standard display settings are desired.
TRANSDUCER INTERFACE CABLE: Optional shielded cable is available mating to the GFM
transducer 9-pin “D” connector. In order to operate flow meter within the specification the
cable length for analog 0-5 Vdc output and remote LCD display may not exceed 9.5 feet (3
meters).
4.1 CE Compliance
Any model GFM bearing a CE marking on it, is in compliance with the below stat-
ed test standards currently accepted.
EMC Compliance with 89/336/EEC as amended; Emission Standard: EN
55011:1991, Group 1, Class B Immunity Standard: EN 55082-2:1992.