Gas Density Analyzers GD402, GD40

Proven design
Highly responsive and sensitive measurement of density. Specific gravity, molecular weight and gas concentration can also be displayed using Yokogawa's gas density analyzing techniques.

Low installation cost
Both explosionproof and general purpose converters are designed for easy mounting on a pipe. Wiring between the detector and converter is based on a two-wire system,keeping installation cost to a minimum

Detector features

・	Resistant to external vibrations
・	Outstanding stability against sudden changes in gas temperature (within 1 g/m3 for sudden changes in gas temperature of 10 deg C)
・	The multi-mode self-oscillation circuit minimizes drift caused by the sensor itself or by oil mist, dust, moisture,etc. sticking to the sensor
・	Easy cleaning and regeneration of sensor. Should the sensor be contaminated with dust and/or mist, then it can be easily cleaned and returned to its original condition.
・	Only routine maintenance is required (for example, once every 3 months).

Measuring object

Gas density of all gases except for corrosive and acetylene gas

Measuring principle

Vibration type (resonant frequency)

Sample gas conditions

Temperature: -10 to 50 deg C (non-condensing)

Pressure: Max. 588.4 kPa (abs)

Gas flow: 0.1 to 1 l/min

Measuring range

Gas density: 0 to 6 kg/m³

Output signal

Output 1: 4-20 mA DC, Isolated, load resistance: 600Ω max.

Output 2: 4-20 mA DC, Isolated, load resistance: 600Ω max.

Explosionproof approval Converter

Rainproof for outdoor use, equivalent to IP65 / NEMA 4X
Ambient temperature :-10 to 55 deg C
Ambient humidity : 5 to 95%RH

GD402T:	FM Explosionproof Approval. Explosionproof for Class I, Division 1, Groups B, C and D; Dust Ignitionproof for Class II, III, Division 1, Groups E, F and G. Enclosure : NEMA Type 4X Temperature code : T6 Electrical connection: 1/2NPT female
GD402V:	CSA Explosionproof Approval. Explosionproof for Class I, Division 1, Groups B, C and D; Dust Ignitionproof for Class II, III, Division 1, Groups E, F and G. Enclosure : Type 4X Temperature code : T6 Electrical connection: 1/2NPT female
GD402R::	TIIS Explosioproof approval. Explosionproof code : Exd IIB+H2T6 Temperature code : T6 Electrical connection: G3/4 female

Explosionproof approval detector

Rainproof for outdoor use, equivalent to IP65 / NEMA 4X
Ambient temperature :-10 to 60 deg C
Ambient humidity : 5 to 95%RH

GD40T:	FM Explosionproof and Intrinsically safe Approval. Explosionproof for Class I, Division 1, Groups B, C and D; Dust Ignitionproof for Class II, III, Division 1, Groups E, F and G with Intrinsically Safe sensor for Class I, II, III, Division 1, Groups B, C, D, E, F and G. Enclosure : NEMA Type 4X Temperature code: T5 Electrical connection : 1/2NPT female Process connection : 1/4NPT female
GD40V:	CSA Explosionproof and Intrinsically safe Approval. Explosionproof for Class I, Division 1, Groups B, C and D; Dust Ignitionproof for Class II, III, Division 1, Groups E, F and G with Intrinsically Safe sensor for Class I, II, III, Division 1, Groups B, C, D, E, F and G. Enclosure : Type 4X Temperature code : T5 Electrical connection : 1/2NPT female Process connection : 1/4NPT female
GD40R:	TIIS Explosionproof and Intrinsically safe Approval. Explosionproof code : Exd [ia] IIB+H2T5 Temperature code : T5 Electrical connection : G1/2 female Process connection : Rc1/4 female

Power supply

100 to 240 V AC, 24V DC, 50/60 Hz