RSE-0503-5

GAS DETECTOR HEAD
GD-F88Di(Oxygen Deficiency Alarm) SPECIFICATION
ModelDetection principle
Gas to be detected
Concentration display
Detection range
Detection method
Suction flow
Alarm preset point*1
Indicate accuracy*2

GD-F88Di
Galvanic cell method
O27-segment LCD (4 digits)
0～25vol%
Suction type (suction unit is required separately)
0.5L/min±10%
18vol%(1st<L>)【Standard】
18vol%(2nd<LL>)【Standard】
Within ±0.7vol%(under an identical condition)

Response time*2

Within 30sec(T90)(excluding delay in the tube)(under an identical condition)

Accuracy of Alarm setpoint＊2

Difference between Alarm setpoint and indicated value of warning
alarm are zero.
*2
Alarm-delay time
By anoxia alarm(Alarm setpoint value:18vol%), Within 5sec(when(under an identical condition)
introducing 10～11vol% gas)
Gas alarm typeTwo-step alarm (L-LL)
Gas alarm indication
Alarm message(AL1/AL2)
Gas alarm action*1
Latching or non latching
Trouble alarm･Self diagnosis
System failure/Sensor failure
Trouble alarm indication
Content display
Trouble alarm action
Non latchingTransmission method
2-wire analog transmission
Transmission specifications
4-20mADC (load resistance: 300Ω or less)Communication scheme
HART 7
Power supply
24VDC±10%Power consumption
Approx. 0.6W
Transmission cable
Shielded cable of CVVS, etc. (1.25mm2) - 2-core
Transmission distance
Up to 1km with CVVS 1.25 mm2 (up to 600m between the detector headand Zener Barrier)
Safety maintaining device*3
Zener Barrier (MTL7728ac/MTL7728+/MTL7728-) orinsulating barrier (MTL5541/RN221N-J1/KFD2-STC4-Ex1)
Piping port
Rc1/4 (O.D Φ6-1t half-union for Teflon tube<PP>supplied)
Operating temperature-10℃ to +40℃ (non-rapidly-vary)
Operating humidity
Less than 95%RH (non-condensing)
Structure
Wall mounted type
Explosion-proof structure
Intrinsically safe explosion-proof structure, with safety
maintaining device (barrier) used
Explosion-proof class
Ex ia ⅡC T4 Ga
External dimensions
Approx. 220(W)x265(H)x90(D)mm (projection portions excluded)
WeightApprox. 2.5kg*1Material
SECC or SUS304
Paint
Bake-coated with melamine
Outer color
Munsell 2.5Y9/2*1 Please specify your request when ordering.
*2 In conformity to JIS T8201 2010(Oxygen deficiency indicator).
*3 Recommended item

RSE-0503-5

Outline Drawings

Install hole
4-M6
Display
Flow meter

Nameplate
External grounding
terminal
Cable inlet
φ9-φ14External piping connecting port φ６(Gas outlet)(Gas inlet)

Terminal Drawings

Groundingterminal＋ －Power supply and
Output signal
4-20mAwithHARTRSE-0671-4

GAS DETECTOR HEAD
GD-F88Di(Gas monitoring) SPECIFICATION
Model
Detection principle
Gas to be detected
Concentration display
Detection range
Detection method
Suction flow
Alarm preset point*1
Indicate accuracyGD-F88Di
Galvanic cell methodO27-segment LCD (4 digits)
0～5vol%/0～10vol%/0～25vol%
Suction type (suction unit is required separately)
0.5L/min±10%
Depend on measuring range
Within ±0.7vol%(below 25vol% range)(under an identical condition)

Response time

Within 30sec(T90)(excluding delay in the tube)(under an identical condition)

Gas alarm type*1
Gas alarm indication
Gas alarm action*1
Trouble alarm･Self diagnosis
Trouble alarm indication
Trouble alarm action
Transmission method
Transmission specifications
Communication schemePower supply
Power consumptionTransmission cable
Transmission distanceTwo-step alarm (H-HH, L-H, and L-LL)
Alarm message(AL1/AL2)
Latching or non latching
System failure/Sensor failure
Content display
Non latching
2-wire analog transmission + digital transmission (HART Communication)
4-20mADC (load resistance: 300Ω or less)
HART 7
24VDC±10%
Approx. 0.6W
Shielded cable of CVVS, etc. (1.25mm2) - 2-core
Up to 1km with CVVS 1.25 mm2 (up to 600m between the detector head andZener Barrier)
Safety maintaining device*2
Zener Barrier (MTL7728ac/MTL7728+/MTL7728-) or
insulating barrier (MTL5541/RN221N-J1/KFD2-STC4-Ex1)
Piping port
Rc1/4 (O.D Φ6-1t half-union for Teflon tube<PP>supplied)
Operating temperature-10℃ to +40℃ (non-rapidly-vary)
Operating humidity
Less than 95%RH (non-condensing)
Structure
Wall mounted type
Explosion-proof structure
Intrinsically safe explosion-proof structure, with safety maintaining
device (barrier) used
Explosion-proof class
Ex ia ⅡC T4 Ga
External dimensions
Approx. 220(W)x265(H)x90(D)mm (projection portions excluded)
WeightApprox. 2.5kg
Material*1
SECC or SUS304
Paint
Bake-coated with melamine
Outer color
Munsell 2.5Y9/2*1 Please specify your request when ordering.
*2 Recommended item

RSE-0671-4

Outline Drawings

Install hole
4-M6
Display
Flow meter

Nameplate
External grounding
terminal
Cable inlet
φ9-φ14External piping connecting port φ６(Gas outlet)(Gas inlet)

Terminal Drawings

Groundingterminal＋ －Power supply and
Output signal
4-20mAwithHART