Fisher IM Supplement: Range Spring, Bias Spring, and Spring Retainer/Spacer Selection for Fisher 3570 Positioners Manuals & Guides

Instruction Manual Supplement

D104021X012

3570 Positioners

April 2022

Range Spring, Bias Spring, and Spring Retainer/

™

Spacer Selection for Fisher

3570 Pneumatic

Valve Positioners

Normally, no adjustments to the 3570 positioner are necessary upon initial installation. The positioner is set at the
factory for the travel, input signal range, and action specified in the order. Adjustment is necessary when operating
conditions are changed, when the unit has been dismantled and reassembled, or when the control valve travel does
not correspond to the desired input signal range. If the operating conditions have changed a new range spring, bias
spring, and spring retainer/spacer may be required.

Refer to the signal range code descriptions below and table 1, 2, 3, and 4. Once the appropriate range spring, bias
spring, and spring retainer/spacer are obtained refer to the Maintenance and Adjustment procedures found in the
3570 instruction manual (D200137X012

Refer to the instruction manual for all other information regarding 3570 positioners.

Signal Range Codes

) available from your Emerson sales office or at Fisher.com.

The range spring and the bias spring are matched to a specific input signal range and length of travel. Also, the spring
retainer length is matched to the application on the 3570, 3570C, 3572, and 3573 positioners. Refer to figure 1 for
location of parts.

The signal range codes in table 1 are based on the following applications:

D Codes for valve travels up to and including 50 mm (2 inches) are used for actuators that have a 50 mm (2 inch)

maximum travel. If the actuator maximum travel is greater than 50 mm (2 inches), an additional retainer spacer
(key 235, see figure 1) is required. Refer to the parts list for the additional spring retainer spacer (key 235) part
number.

D Codes for valve travels greater than 50 mm (2 inches), up to and including 105 mm (4‐1/8 inches), are used for

actuators that have a 105 mm (4‐1/8 inch) maximum travel, except the 480‐12 or 480‐15 Size 20 actuators which
have a 54 mm (2‐1/8 inch) maximum travel. If the actuator maximum travel is greater than 105 mm (4‐1/8 inches),
an additional retainer spacer are required. Refer to the parts list for the additional spring retainer spacer (key 235)
part numbers.

D Codes for valve travels greater than 105 mm (4‐1/8 inches), up to and including 206 mm (8‐1/8 inches), are for

actuators that have a 206 mm (8‐1/8 inch) maximum travel. If the valve travel is 105 mm (4‐1/8 inches) or less, two
additional spring retainer spacers are required. Refer to the parts list for the additional spring retainer spacer (key

235) part numbers.

If the input signal range and travel do not match any of the selections in table 1, consult your Emerson sales office for
information. To change the springs, refer to the range and bias spring procedures in the Maintenance section of the
3570 instruction manual (D200137X012

From table 1, select the signal range that matches your application. Find the travel length for the application under the
signal range selected, then use the code (from the direct or reverse column) that matches the direct or reverse
operation of the positioner.

).

www.Fisher.com

3570 Positioners

April 2022

Instruction Manual Supplement

D104021X012

The first number in the code is used to identify the range spring, the letter in the code is used to identify the bias
spring, and the second number (after the letter) is used to identify the spring retainer. For example, from table 1, for a
signal range of 0 to 1.0 bar (0 to 15 psig), an actuator travel of 14.3 mm (9/16‐inch), and direct action, the signal
range code from table 1 is 6G3. The “6” indicates the range spring. The “G” indicates the bias spring. The “3” indicates
the spring retainer.

Note

It is necessary to add the bias spring seat (key 8) to a unit when changing from an extension type spring (key 9) to a compression
type spring (key 48).

When planning to change the bias spring in an existing unit, inspect the unit first to determine if the current bias
spring is an extension type spring (key 9) or a compression type spring (key 48). To change from an extension type
spring to a compression type spring, it is necessary to add the bias spring seat (key 8). Refer to the appropriate
procedures in the Maintenance section found in the 3570 instruction manual (D200137X012

).

In some cases, it is necessary to add an additional spring retainer spacer or change from the standard bellows to the
optional high pressure bellows. Table 1 footnotes indicate the use of an additional spring retainer spacer or high
pressure bellows.

Use the code from table 1 while referring to tables 2, 3, and 4 to determine the part numbers for the range spring, bias
spring, and spring retainer. Unless otherwise specified, use the standard bellows. Also, no spring retainer spacer is
required unless the spacer is specified in the footnotes of table 1.

2

Instruction Manual Supplement

D104021X012

3570 Positioners

April 2022

Table 1. Fisher 3570 Signal Range Codes

SIGNAL RANGE

0 to 1.0 bar (0 to 15 psig)

0.2 to 0.6 bar (3 to 9 psig)

(1)

SIGNAL RANGE

SIGNAL RANGE

0.2 to 1.0 bar (3 to 15 psig)

SIGNAL RANGE

0.2 to 1.0 bar (3 to 15 psig)

Travel Code Travel Code Travel Code Travel Code

mm Inches Direct Reverse mm Inches Direct Reverse mm Inches Direct Reverse mm Inches Direct Reverse

54

14.3

17.5
19

20.6

26.2

28.6

30.2

38.1

39.7

44.5

50.8

79.4

101.6

104.8
127

9/16

11/16

3/4

13/16

1‐1/32

1‐1/8

1‐3/16

1‐1/2

1‐9/16

1‐3/4

3‐1/8

4‐1/8

6G3
2G4
7A1
7G1

5A12

5C8

12A13

8G5

8G12

8G5

2

8G5
9A3

4

9A12

9G1

5

21B8

SIGNAL RANGE

0 to 2.0 bar (0 to 30 psig)

15.9

25.4

28.6

33.3

38.1

50.8

76.2

79.4

101.6

104.844‐1/8

5/8
3/4

10D2
10D3

1

11A4
11A5

11A12

11D12

2

2G5

(2)

12G7

(8)

12G10

12C3

3

(3)

12G8

19

1‐1/8

1‐5/16

1‐1/2

54

2‐1/8

54

2‐1/8

3‐1/8

1G1
1G1

SIGNAL RANGE

0.2 to 0.6 bar (3 to 9 psig)

11.1

12.7

15.9

19

22.2

25.4

27

28.6

35

38.1

41.3

50.8

54
54

58.7

63.5

7/16

1/2
5/8
3/4
7/8

1‐1/16

1‐1/8
1‐3/8
1‐1/2

1‐5/8

2‐1/8

2‐1/8

2‐5/16

2‐1/2

5G5

8G5
8G10
8G13

8G8

1

4G8

4G8

9G8

9G8

9G8

9G8

2

15G8
15A1

(8)

15G5
15G1
15G3

6D3
2G4
7C3
7B1

5D12

5C8

12C13

8B5

8B12

8A5

8A5
9B3

9B12

9B1

21D8

10D2
10D3
11D4
11D5

11D12

11D12

2D5

12D7

12D10

12C3
12D8

1D1
1C1

5A5

8A5
8A10
8A13

8B8

4B8

4B8

9A8

9A8

9A8

9A8
15A8
15A1
15A5
15A1
15A3

66.7

2‐5/8

76.2

79.4

82.6

85.7

88.9

96.8

101.6

104.8

117.5

127

152.4

165.1

177.8

203.2

206.4

3‐13/16

4‐5/8

3
3‐1/8
3‐1/4
3‐3/8

3‐1/2

4
4‐1/8

(3)

5

6
6‐1/2

7

8
8‐1/8

15G13

14G8
14G8
14G8
14G8

14G8
14G8
14G8
14G8

(2)

13G3

13G4
13G3
13G3
13G8
18G8
18G8

SIGNAL RANGE

0.2 to 1.0 bar (3 to 15 psig)

3.2

1/8

17H4

3.2
4

6.4

8.7

9.5

11.1

11.9

12.7

14.8

15.9

17.5
19

20.6

22.2

23.8

25.4
27

28.6

31.8

33.3

35

36.5

38.1

39.7

41.3

44.5
46

47.6

50.8

(6)

1/8

5/32

1/4

11/32

3/8

7/16

0.469
1/2

0.582
5/8

11/16

3/4

13/16

7/8

15/16

1

1‐1/16

1‐1/8
1‐1/4

1‐5/16

1‐3/8

1‐7/16

1‐1/2

1‐9/16

1‐5/8

1‐3/4

1‐13/16

1‐7/8

2

10D3
10D2
10B4

6A3
6A3

6A4
6A4
7G1
5G4
7G3

7G4
7G4
7A5
5G5
8G5

8G5
8G12
8G12
8G12
8G10

8G10
8G13
8G13

8G8

8G8

8G8

4G8

4G7

4G8

15A13

14A8
14A8
14A8
14A8

14A8
14A8
14A8
14A8
13A3

13A4
13A3
13A3
13A8
18A8
18A8

17H4
10D3
10H2
10H4

6C3
6C3

6D4
6D4
7C1
5C4
7B3

7B4
7C4
7B5
5C5
8B5

8B5
8B12
8B12
8B12
8C10

8B10
8B13
8B13

8C8

8B8

8B8

4C8

4B7

4B8

54

55.6

57.1

58.7

59.5

60.3

63.5

66.7

68.3

69.9
73

74.6

76.2

78.5

79.4

82.6

84.9

85.7

86.5

88.9
92

92.9

95.3

96.8

100

101.6

101.6

104.8
108

111.1

114.3

116.8

117.5

120.7
127

133.4

139.7

152.4

155.6

165.1

169.9

171.5
173

177.8

181.8

188.1

-Continued-

2‐1/8

2‐1/8

2‐3/16

2‐1/4

2‐5/16

2‐11/32

2‐3/8

2‐1/2
2‐5/8

2‐11/16

2‐3/4
2‐7/8

2‐15/16

3.09
3‐1/8
3‐1/4

3‐11/32

3‐3/8

3‐13/32

3‐1/2
3‐5/8

3‐21/32

3‐3/4

3‐13/16
3‐15/16

4

4‐1/8

4‐1/4
4‐3/8
4‐1/2

4.6

4‐5/8
4‐3/4

5

5‐1/4

5‐1/2

6
6‐1/8
6‐1/2
6‐11/16

6‐3/4
6‐13/16

7‐5/32

7‐13/32

3

4

(6)

(5)

(5)

7

(4)

(8)

(4)
(2)
(6)

(2)
(2)

(5)

(5)

(5)
(5)

(5)

(2,6)

4G1
4G8

9G3
9G3
9G2
9G3
9G3

9G3

9G3
9G10
9G10

9G5

9G5
9G12

9G8

9G7
9G10

9G8
9G13
9G10
9G13
9G13

9G8

9G8

9G8
21G8
21G8

14G1
16G8

16G13

16G1
20A8

16G4
16G3
16G3
14G1

19G10

14G1
13G3
13G3
13G3
20G3

13G5
20G3
20G5
13G1
20G3

4B1
4B8

9B3
9B3
9B2
9B3
9B3

9B3

9B3
9B10
9B10

9B5

9B5
9B12

9B8

9B7
9B10

9B8
9B13
9B10
9B13
9B13

9B8

9B8

9C8
21B8
21A8

14A1
16B8

16D13

16C1
20C8

16C4
16B3
16B3
14C1

19C10

14B1
13A3
13A3
13A3
20B3

13A5
20B3
20C5
13A1
20B3

190.5

196.6

198.9

203.2

206.4

193

7‐1/2

7.6

7‐3/4

7‐13/16

8

8‐1/8

19G5
19G8
19G3
19G8
19G8

19G12

SIGNAL RANGE

0.2 to 1.8 bar (3 to 27 psig)

9.5

11.1

15.9

22.2

25.4

28.6

31.8

33.3

38.1

43.9

47.6

50.8

63.5

76.2

79.4

82.6

88.9

101.6

104.8

114.3
127

133.4

152.4

190.5

203.2

3/8

10A2

7/16

10A2
5/8
3/4
7/8

5

6

8

3A2
11A4
11A5

1

2C5

2A5

5G4
2A12
2C10

2G12
2G10

2

5G10
12A3

(8)

12G13

1A3

3

1B12
1A12

4G1

4G4

4

4G1

4G5

(7)

21A13

(6)

21A4

(6)

21A3

(5)

16G3

(2)

21G1

(4)

21G10

19

1‐1/8
1‐1/4

1‐5/16

1‐1/2

1.73

1‐7/8

54

2‐1/8

54

2‐1/8

2‐1/2

3‐1/8
3‐1/4
3‐1/2

4‐1/8

4‐1/2

5‐1/4

7‐1/2

SIGNAL RANGE

0.4 to 1.2 bar (6 to 18 psig)

19

3/4

28.6

38.1

50.8
54
54

76.2

101.6

104.8

152.4

1‐1/8
1‐1/2

2‐1/8

2‐1/8

4‐1/8

5G5

8G12

8G8

2

4G8
9G3

(8)

9G12

3

9G5

4

21G8
16G8

(4)

6

13G1

19C5
19C8
19B3
19B8
19B8
19B3

10D2
10D2

3D2
11D4
11D5

2C5

2D5

5D4
2D12
2C10

2D12
2C10
5D10
12D3

12D13

1D3

1D12
1D12

4C1

4D4

4B1

4D5

21D13

21D4
21D3
16C3

21D1

21D10

5C5
8B12

8B8

4B8

9C3
9B12

9C5
21B8
16B8
13B1

3