Specialized manufacturer of Digital Pressure Meters and Load Cells

VALCOM CO.,LTD.

Discontinued

Intrinsic Safety Explosion-proof Barrier Zener-barrier(for Transducer)
Zener-barrier series MTL761ac / MTL764ac

Zener-barrier
  • Explosion-proof rate:: ia2G3
Applicable Sensor VPRF, VPRQ(F), VPRNP
Measured medium Media that will not corrode SUS630 and 15-5PH (precipitation-hardened stainless steel), SUS316L
(Refer to the individual specifications.)
Measured Range VVPRNP: 100 to 1700kPa or 100 to 1700kPa abs / VPRQ, VPRF: 1 to 50MPa / VPRQF: 1 to 100MPa
(Refer to the individual specifications.)

Specifications

Explosion-proof Rating ia2G3
Installation Class A (1) grounding
Operation Voltage ±2.5V or 5V
Ambient Temperature Applicable Sensor VPRF, VPRQ, VPRQF: -20–60°C
VPRNP: -20–50°C
Zener-barrier −20–60°C
Rating of Intrinsically Safe Circuit Maximum voltage 24V / Maximum current 224mA / Maximum power 0.522W
Allowable Inductance for External Lines 1mH or less
Allowable Capacitance for External Lines 0.1µF or less
Measured medium Media that will not corrode SUS630 and 15-5PH (precipitation-hardened stainless steel), SUS316L (Refer to the individual specifications.)

Individual specifications

System model (Certification) SA-010-00 SA-010-00
TIIS Certification Number No. T68568 No. T68670
Zener-barrier form MTL761ac / MTL764ac MTL761ac / MTL764ac
Applicable sensor series VPRF VPRQ VPRQF VPRNP
Rated capacity 1–50MPa 1–50MPa 1–100MPa 100–1700kPa
100–1700kPa(abs)
Accuracy
(Applicable Sensor element)
Non Linearity / Hysteresis
±0.5%R.C. ±0.8%R.C. ±0.8%R.C.
(100MPa: ±1%R.C.)
±0.25%R.C.
Connection Screw G3/8 R3/8 G3/8
(100MPa: G1/2)
R3/8, G3/8
Material SUS630 or 15-5PH (precipitation-hardened stainless steel) SUS316L
Accessories 1 Aluminum packing
(50MPa: 1 Copper packing)
- 1 Copper packing -

Zener-barrier model

MTL761ac / MTL764ac (Accessories: Bus bar IS-BB-2P Clip for a flat mounting SMC7(Set of 4))

Model Selection

Example

Photo ①Model ②Rated Capacity(R.C.) ③Cable Connection ④Connection Screw ⑤Other length Link
VPRF 1MP(1MPa)
2MP(2MPa)
5MP(5MPa)
10MP(10MPa)
20MP(20MPa)
50MP(50MPa)
Blank
(Standard connector)
W
(Waterproof connector)
G3/8 3m(Standard)
5m
10m
□□m

If you prefer
other length(*3)
VPRF
VPRQ 1MP(1MPa)
2MP(2MPa)
5MP(5MPa)
10MP(10MPa)
20MP(20MPa)
35MP(35MPa)
50MP(50MPa)
R3/8 VPRQ,
VPRQF
VPRQF 1MP(1MPa)
2MP(2MPa)
5MP(5MPa)
10MP(10MPa)
20MP(20MPa)
35MP(35MPa)
50MP(50MPa)
100MP(100MPa)
G3/8
(100MPa: G1/2)
VPRNP Guage Pressure 100(100kPa)
200(200kPa)
700(700kPa)
1700(1700kPa)
R3/8
G3/8
Specify thread size.
VPRNP
Absolute Pressure 100A(100kPa abs)
200A(200kPa abs)
700A(700kPa abs)
1700A(1700kPa abs)
Cable length
  • Note
  • *1 Always use in combination with VALCOM amplifier.
    Models are subject to change in part due intrinsic safety or explosion-proof purpose. Always contact our sales office for confirmation.
  • *2 Please order the cable length between VALCOM amplifier and Zener-barrier.
  • *3 Between Conformity sensor and Zener-barrier use dedicated to cable for safe explosion-proof. (Max 200m / VPRNP guage pressure · W(Waterproof connector): Max 100m)

Examples of explosion-proof construction

①Ignition temperature
Ignition temperature Ignition point Limit of temperature rise (°C)
G1 Over 450°C 320
G2 Over 300°C up to 450°C 200
G3 Over 200°C up to 300°C 120
G4 Over 135°C up to 200°C 70
G5 Over 100°C up to 135°C 40
G6 Over 85°C up to 100°C 30
Examples of explosion-proof construction ②: Flame-proof grade explosion class
(Minimum gap width to allow transmission of flame)
1: Over 0.6mm
2: Over 0.4mm up to 0.6mm
3: 0.4mm or less
③: Explosion-proof construction
i: Meets the requirements of intrinsically safe explosion-proof construction.
d: Meets the requirements of flameproof enclosure.
Ignition degree G1 G2 G3 G4 G5 G6
1 (Over 0.6mm) Over 450°C Over 300°C
up to 450°C
Over 200°C
up to 300°C
Over 135°C
up to 200°C
Over 100°C
up to 135°C
Over 85°C
up to 100°C
1 (Over 0.6mm) Acrylonitrile
Acetonitrile
Acetone
Ammonia
Carbon monoxide
Isobutyl methyl ketone
1,1-Dichloroethene
1,2,4-Trimethylbenzene
Ethane
Ethyl methyl ketone
m-Xylene
Isopropyl chloride
O-Xylene
Chlorobenzene
Acetic acid
Ethyl acetate
Methyl acetate
Hydrogen cyanide
Ethyl bromide
Styrene
Toluene
P-Xylene
Propane
Benzene
Benzotrifluoride
Methanol
Methane
Ethyl acrylate
Eethyl acrylate
Acetylacetone
Trioctanoic
Isobutanol
Isopentane
1,2-Dichloroethane
1-Butanol
1,4-Dioxane
Ethanol
Epichlorohydrin
Polyvinyl chloride
Isoamyl acetate
Isopentyl acetate
Vinyl acetate
Butyl acetate
Propyl acetate
Pentyl acetate
Diisopropyl ether
Cyclohexanone
Thiophene
2-Propanol
Butane
Furan
Propylene
Acetic anhydride
Methyl methacrylate
1-Hexanol
1-Pentanol
Butyl chloride
Octane
Gasoline
3-Methylhexanoic acid
Cyclohexane
Dimethyl ether
Decane
Tetrahydrofuran
2-Methylhexane
Butyraldehyde
Hexane
Heptane
Pentane
Acetaldehyde
(di) ethyl ether
Dibutyl ether


Lisk
  Ethyl nitrite
2 (Over 0.4mm
up to 0.6mm)
Coal gas
(trans-)1.2-Dichloroethene
1,3-Butadiene
Ethylene
Ethylene oxide
Propylene oxide
       
3 (Up to 0.4mm) Water gas
Hydrogen (a)
Acetylene (c)     Carbon bisulfide (b) Nitric acid
Ethyl

External dimensions (Unit: mm)

External dimensions

Wiring diagram

Wiring diagram
Specifications
Target gas ia2G3
Operation Voltage ±2.5 or 5V
Allowable voltage AC250V 50/60Hz DC250V
Ambient temperature Sensor −20 to +60°C (VPRF, VPRQ, VPRQF)
-20 to +50°C (VPRNP)
Zener-barrier −20 to +60°C
Rating of this intrinsically safe circuits
Maximum voltage 24V
Maximum current 224mA
Maximum power 0.522W

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