WIKA IS-20, IS-21 Data sheet

Electronic
Pressure Measurement

Intrinsically Safe Hazardous Area Transmitters
Type IS-20, IS-21, IS-20-F, IS-21-F

Applications

■ Chemical, Petrochemical

■ Oil and gas rening

■ Food industry

■ Mechanical engineering

Special Features

■ Pressure ranges from 50 InWC to 15,000 psi

■ FM, CSA approval for

- Intrinsically safe Class I, II and III Division 1,

Group A, B, C, D, E, F, G

- Dust Class II and III Division 1, Group E, F, G

- Class I, Zone 0, AEx ia II C

■ Ex- protection EEx ia I/II C T6 according to ATEX for:

Gases, vapors and mist: Connection to Zone 0,
Zone 1 and Zone 2
Dust: Connection to Zone 20,
Zone 21 and Zone 22
Mining: Category M1 and M2
Suitable for SIL 2 according to IEC 61508 / IEC 61511

Left: IS-20-S standard version
Center: IS-21-S with ush diaphragm
Right: IS-20-F with integral junction box

Datasheet IS-20, IS-21

Description

Approvals meet international standards

The IS-20 series of intrinsically safe pressure transmitters
are designed for industrial pressure measurement
applications in hazardous areas where intrinsically safe rat­ings are required.

Multiple intrinsically safe approvals include FM, ATEX
and CSA. These multiple approvals provide for global
recognition and acceptance of the intrinsically safe ratings.
The transmitters are labeled with all three approvals to help
support international shipments of OEM equipment
designed with these transmitters.

Rugged construction

The stainless steel wetted parts feature an all-welded mea­suring cell for improved media compatibility. There are no
internal soft sealing materials that may react with the media
or deteriorate over time. The compact case is also made of
stainless steel and is available with environmental protection
ratings up to NEMA 6 ( IP 68).

Datasheet IS-20, IS-21 · 1/2011

The IS-21-S and IS-21-F transmitters feature a ush
diaphragm process connection. They are specically
designed for the measurement of viscous uids or media
containing solids that may clog a NPT process connection.

Types IS-20-F and IS-21-F feature an integral stainless steel
junction box with internal terminal block for use in extremely
harsh environments. A ½“ NPT female conduit connection is
standard on all models and a cable compression electrical con­nection is available as an option.

All types require a 10 to 30 volt supply provided by an
intrinsically safe power supply or through an approved
intrinsically safe zener diode barrier.

Page 1 of 8

R

Specications Type IS-20-S, IS-21-S, IS-20-F, IS-21-F

Specications without type designation apply for all types.

Pressure range
Maximum pressure*
Burst pressure**
Pressure range
Maximum pressure*
Burst pressure**

{vacuum, gauge pressure, compound ranges, and absolute pressure references are available}

1)

Ranges only available with Type IS-20

2)

For Type IS-21 the burst pressure is limited to 21,000 psi unless the pressure seal is accomplished by using the sealing ring underneath the hex.

*Pressure applied up to the maximum rating will cause no permanent change in specications but may lead to zero and span shifts

**Exceeding the burst pressure may result in destruction of the transmitter and possible loss of media

Materials

 Wetted parts

 Models IS-20-S, IS-20-F
 Models IS-21-S, IS-21-F

 Case

Internal transmission uid

Power supply U
Signal output and 4 ... 20 mA, 2-wire
Maximum load R

 Models IS-20-S
 Models IS-20-F

Test circuit signal / max. load R
Adjustability zero/span % ± 5 using potentiometers inside the instrument
Response time (10 ... 90 %) ms < 1 (< 10 ms at media temperatures below –22°F (-30°C) for ranges < 300 psi
Power Pi W 1 (750 mW with approval for Category 1D)
Isolation voltage Isolation complies with EN 50020, 79-11
Accuracy

5)

Non-linearity % of span ≤ 0.2 (BFSL) according to IEC 61298-2
Non-repeatability % of span ≤ 0.1
1-year stability % of span ≤ 0.2 (at reference conditions)
Permissible temperature

 Medium

 Ambient
 Storage

7) 8)

7) 8)

8)

Compensated temperature range 32 ... +176°F 0 ... +80°C
Temperature coecients (TC) within
compensated temperature range:

 Mean TC of zero % of span

 Mean TC of range % of span ≤ 0.2 / 10 K

CE-conformity

 Pressure equipment directive 97/23/EC

 EMC directive

50 InWC 5 psi 10 psi 25 psi 30 psi 60 psi 100 psi 160 psi 200 psi
15 psi 29 psi 58 psi 145 psi 145 psi 240 psi 500 psi 1,160 psi 1,160 psi
29 psi 35 psi 69 psi 170 psi 170 psi 290 psi 600 psi 1,390 psi 1,390 psi
300 psi 500 psi 1,000 psi 2,000 psi 3,000 psi 5,000 psi 8,000 psi 10,000 psi
1,160 psi 1,160 psi 1,740 psi 4,600 psi 7,200 psi 11,600 psi 17,400 psi 17,400 psi 21,750 psi
1,390 psi 5,800 psi 7,970 psi 14,500 psi 17,400 psi 24,650 psi

2

34,800 psi234,800 psi 43,500 psi

(for other materials see WIKA diaphragm seal program)
Stainless steel
Stainless steel {Hastelloy

®

C4}

O-ring: NBR {Viton® or EPDM}

3)

3)

Not available with Type IS-20 in pressure ranges > 300 psi

4)

Media temperature for oxygen version: -4 ... +140 °CF (-20 ... +60 °C). Not available in vacuum

or absolute pressure ranges or in Type IS-21 ush diaphragm version > 500 psi

B

A

DC V 10 < U ≤B 30 (11 < UB < 30 with Type IS-20 -F)

A

% of span ≤ 0.25 {0.125}
% of span ≤ 0.5 {0.25}

5)

Including non-linearity, hysteresis and repeatability.

Limit point Calibration performed in vertical mounting position with pressure connection facing down.

6)

For pressure ranges above 100 InWC

-20 ... +80 °C

-20 ... +80 °C

7)

Other temperature ranges are possible, depending on the electrical connection; see EC-type

8)

Also complies with EN 50178, Tab. 7, Type C, Class 4KH Operation, 1K4 Storage, 1K3 Transport

9)

Response time for IS-20: < 10 ms at medium temp. below -30 °C (-22 °F) for pressure ranges up to 300 psi

Response time for IS-21: < 10 ms at medium temp. below -30 °C (-22 °F) for all pressure ranges

Stainless steel
Synthetic oil {Halocarbon® oil for oxygen applications} 4) {Listed by FDA for food
applications}

≤ (UB – 10 V) / 0.02 A – (length of cable in feet x 0.043 Ohm)

R

A

≤ (UB – 11 V) / 0.02 A

R

A

in Ohms and UB in Volts

with R

A

RA < 15 Ohm (only for Type IS-20 -F)

6)

(BFSL)

6)

(limit point calibration)

7)

{extended temperature ranges see page 6}

7)

7)

-4 ... +176 °F

-4 ... +176 °F

7)

7)

-30 ... +105 °C -22 ... +221 °F

≤ 0.2 / 10 K

(< 0.4 for pressure range < 100 InWC)

2004/108/EC, EN 61 326 Emission (Group 1, Class B) and
Immunity (industrial locations)

1

15,000 psi

1

Page 2 of 8 Datasheet IS-20, IS-21 · 1/2011

Specications Type IS-20-S, IS-21-S, IS-20-F, IS-21-F

■

Directive ATEX of equipment
intended for use in potentially 94/9/EC
explosive atmospheres

Ex-protection ATEX Category

Ignition protection type Ex ia I/II C T4, Ex ia I/II C T5, Ex ia I/II C T6

Ex-protection FM, CSA Class I, II and III

Ignition protection type Intrinsic safe Class I, II, III Division 1,

HF-immunity V/m 10

Burst kV 2

Functional safety Suitable for SIL 2 applications according to IEC 61508/ IEC 61511

Shock resistance

» Type IS-2X-S g 1,000 according to IEC 60068-2-27 (mechanical shock)

» Type IS-2X-F g 600 according to IEC 60068-2-27 (mechanical shock)

Vibration resistance

» Type IS-2X-S g 20 according to IEC 60068-2-6 (vibration under resonance)

» Type IS-2X-F g 10 according to IEC 60068-2-6 (vibration under resonance)

Wiring protection

■

Short-circuit Sig+ towards UB-

■

Reverse polarity UB+ towards UB-

Weight  Type IS-2X-S

 Type IS-2X-F

*) In an oxygen version type IS-21 is not available. In an oxygen version type IS-20 is only available in gauge pressure ranges ≥ 0.25 bar with media temperatures between

-20 … +60 °C / -4 … +140 °F and using stainless steel or Elgiloy® wetted parts.
{ } Items in curved brackets are optional extras for additional price.

8)

Read the operating conditions and safety-relevant data in the EC-type examination

certicate in any case (BVS 04 ATEX E 068 X)

Group A, B, C, D, E, F, G and Class I, Zone 0 AEx ia II C

Further information: "Additional Instructions Safety-related data IS-2X SIL"

lb Approx. 0.45

lb Approx. 0.80

8)

1G, 1/2G, 2G, 1D, 1/2D, 2D, M1, M2

Output signal and permissible load

Type IS-2X-S

4 ... 20 mA, 2-wire

Type IS-2X-F

4 ... 20 mA, 2-wire

permissible range

permissible range

Supply
Voltage

Output current (2-wire) Output current (2-wire)

4 ... 20 mA: RA < (UB – 10 V) / 0.02 A 4 ... 20 mA: RA < (UB – 11 V) / 0.02 A

Datasheet IS-20, IS-21 · 1/2011 Page 3 of 8