Bulletin No. MCE-B6103J

General Specifications
Model EA91A Flameproof TypeExplosion‐protected Construction
Model EA90A Intrinsic Safety Type Explosion‐protected Construction

ELECTRO‐PNEUMATIC VALVE POSITIONER
The Models EA91A/EA90A electro‐pneumatic valve positioners
are mounted to control valve as accessories. This device
converts electric signals transmitted from controller into
pneumatic pressure to control the valve opening position
precisely.
 Model EA91A：This is an explosion‐protection certiﬁed
product which is available to use forﬂammable and explosive gas atmospheres
including Hydrogen.
 Model EA90A：This is available to use for intrinsic safety typeof explosion‐protection in combination withsafety barriers.

1. FEATURES
1. Certiﬁed Explosion‐Protection in accordance with the New Recommend practice［Complied with the new technical standard (IEC matching standard) test］
 Model EA91A："Ex sd ⅡC T6X" …… ﬂameproof type.
 Model EA90A："Ex ia ⅡC T5" …… intrinsic safety type.
2. Economical and Highly Reliable
 These products are interchangeable with the former products EA91/EA90；No additional parts or works
required.
 The consumable parts (e.g. pilot) required are also compatible with the former products.
 Measures against vibration and impact are highly improved on reducing the weight by 20%.
 Applicable to a wide range of actuator size and maintains very stable/reliable performance.
 Achieved Protection is IEC class IP65. IP66 is available as option.
3. Wide Function
 Applicable to a single acting rotary valve by using cam.
 Includes manual changeover system that allows manual switching operation.
 The design provides conformity to a control valve.
4. Easy Maintenance Allows easier overhaul by adopting a unit construction. (Construction is the same as EA91/EA90).
 All external bolts and nuts are made of stainless steel which provides superior corrosion resistance andworkability.
 Pilot valve assembly is the same one as those of EA91/EA90 and has suﬃcient experience of ﬁeld‐provenand reliable function.

‐1‐Model EA91A&EA90A
2. STANDARD SPECIFICATION
Model EA91A
Lever Type(Single Action)

Type

Model EA91AC
Cam Type(Single Action)

Model EA90A
Lever Type(Single Action)

Input Current

4 to 20mA DC

Input Resistance250Ω

Supply Air PressureMAX. 500kPaG （5.0kgf/cm2G）

Connection

Structure

Flameproof Type

Explosion
protection

Intrinsic Safety Type(JIS)Ex sd ⅡC T6X(NEPSI)

Ex dmb ⅡC T6 Gb(KOSHA)Ex dmb ⅡC T6

Protection ClassAir Piping
Connection
Conduit
Connection
OutputCharacteristics(JIS)

Ex ia ⅡC T5(NEPSI)Ex is ⅡC T5 Ga

IEC IP65 (※ IEC IP66)
Rc1/4 (PT1/4)
G1/2
Linear
10 to 65mm(※ over 65 to 130mm)

60° (Linear)(※ 60°Eq%, 90°Linear)

10 to 65mm(※ over 65 to 130mm)

60° (Linear)(※ 60°Eq%, 90°Linear)

Linearity≦±1.0% F.S.

≦±2.0% F.S.

≦±1.0% F.S.

≦±2.0% F.S.

Hysteresis Error
Dead band(substance alone)
Repeatability≦≦≦≦

Standard Stroke

Characteristics

Model EA90AC
Cam Type(Single Action)

1.0% F.S.

≦ 0.1% F.S.

1.5% F.S.

≦ 0.3% F.S.

1.0% F.S.

≦ 0.1% F.S.

≦

1.5% F.S.

≦ 0.3% F.S.

0.3% F.S.
2

Air Consumption
Max. Supply andExhaust of air
Insulation
Resistance≦ 6.0ℓ/min Nor （SUP. 140kPaG（1.4kgf/cm G）, Signal 50%）
270ℓ/min Nor （SUP. 140kPaG（1.4kgf/cm G）, Signal 50%）≧ 100MΩ (with 500VDC Mega between terminal and case)‐40℃ to +100℃

Ambient Temp.

‐ 20℃ to +60℃

( ‐20℃ to +60℃ for Explosion protection)
Painting Color

Munsell 2.5PB 5/8 (Blue)

WeightApprox. 2.9 kg【Notes】 (1) ※Available as options on customer's request.
(2) Model EA90A/EA90AC positioner is not available for reverse action type pilot.

3. MODEL NUMBERING SYSTEM
Speciﬁcations

Basic Model No.

Flameproof TypeEA91A

Intrinsic safety Type

EA90A

Specification CodeStructure
Displacementtransfer Method
Method of LeadingExternal Cable

Lever Type(None)

Cam TypeCConduit Type (Standard)(None)

Explosion‐proof connector withpacking Type (option)

T【Note】If method of leading external cable is explosion‐proof connector (Spec. code: T ), applicable standard is JIS, ﬂameproof.
In case of NEPSI ﬂameproof type, ﬂameproof packing connector (cable glands), certiﬁed by NEPSI, shall be supplied bycustomer.

‐2‐Model EA91A&EA90A
4. CONSTRUCTION Lever Type Cam TypeRestriction

 Right lateral faceSupply Air Connection

Pilot Valve

Supply Pressure Gauge

Output Air ConnectOutput Pressure Gauge

CamStroke Adjustment
knob

A/M Switching Screw
Zero Adjustment knob
Terminal Box

Conduit Connection

NozzleBodyFlapper

5. EXTERNAL DIMENSIONS
 Left lateral face

Unit: mm Lever TypeAir Connection
2‐Rc1/4

 Cam TypeTypeA
B

Actuator Size

φ200～φ330
φ400～φ650

146(A Type)206(B Type)

Conduit Connection
G1/2■Leading External Cable Gland Conduit Type (standard)
Model：EA91A(C)/ EA90A(C) Flameproof Packing Type (optional)
Applicable cable OD：φ9.1～φ11
Model：EA91A(C) T
KXB‐LO‐16(Standard)‐3‐

KXB‐LO‐16F(Optional Spec.)

Model EA91A&EA90A
6. System construction(EA90A Type intrinsically safety construction)

Hazardous area
Electro‐pneumaticpositioner

Non Hazardous area
Safety barrier

General device
SourceEarth bus barCaution

Safety earth

To combine with a safety barrier
The safety barrier which is used in combination with Electro‐pneumatic positioner EA90A must be※2TIIS certiﬁed type.
For the safety barrier selection, please refer to the following data for intrinsically safe approval of Model EA90A.
① Performance classiﬁcation and Groupia ⅡC② Permissible maximum values
Ui = 30V, Ii = 100mA, Pi = 0.75W③ Parameters
Ci = negligibly small
Li = negligibly small※2TIIS；Technology Institution of Industrial Safety（JAPAN）※Motoyama distribute recommended safety barriers. If you are interested or have any questions about the product,
please contact our sales oﬃces or sales agents.

‐4‐Bulletin No.MCE-B6103J

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