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1:4 Ratio Factory Direct Replacement Amplifying Relay (Robertshaw)

Price: $987.88 
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SKU: REL101A4
(See Product Details Below for Manufacturers Part Numbers)
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(PLEASE ALLOW 2 WEEKS BEFORE SHIPPING OF THIS ITEM)1:4 Ratio Factory Direct Replacement Amplifying Relay (Robertshaw)



The Model CR100 Series A and B Ratio Relays comprise a

group of proportioning units designed for use in industrial

pneumatic control systems where the application requires

amplifying or reducing the volume of control air in a

pre-determined ratio. They are available in input to output

ratios of 1:1.5 through 1:6 and 1.5:1 through 6:1. The relay

components are made of steel and aluminum, and the

diaphragms are Buna-N on nylon.



Other features include:



•Fully pneumatic, eliminating any explosion hazard




•Available in a wide variety of input and output pressures




•Functions include addition, subtraction, multiplication, biasing and reversing




•Relay components are made of stainless steel and aluminum




•Diaphragms are Buna-N, nylon-reinforced




Specifications:


Input Pressure Range:

25 psig (1.8 bar) maximum for amplifying

90 psig (6.3 bar) maximum for reducing


Supply Pressure:


60 psig (4.2 bar) maximum (should always be at least

10 psig [0.7 bar] greater than output pressure.)


Output Pressure:........................50 psig (3.5 bar) maximum

Action:................................................................ Proportional


Ambient Temperature Limits:


-40
• F. to 180
• F. (-40
• C. to 82
• C.)

Connections: .............................................. 1/4" female NPT

(Exhaust connection is 1 / 16" female NPT)

Weight: ......................................................1.0 lb. (0.45 Kg.)


PERFORMANCE DATA


Ultimate Sensitivity: .............................. 0.1% of full range

Supply Pressure Effect: ........Change in output pressure for

5 psig (0.35 bar) supply pressure change, less than 1%

of full range.


Ambient Temperature Effect: ........ Change in output for a

75 F. (24
• C.) ambient temperature change - 0.5% of full

range.


Air Consumption: Maximum .............................. 7.0 SCFH

For Maximum Flow:

Supply output capacity .....................3.0 SCFM nominal

Exhaust output capacity ..................5.0 SCFM nominal



OPERATION


The output pressure is proportional to the input pressure as

the effective area of the input diaphragm is to the effective

area of the output diaphragm.

Air pressure in the input chamber exerts a downward force

on the diaphragm. This force moves the center assembly

down, closing the exhaust valve. Further movement opens

the lower portion of the valve allowing the supply air

pressure to enter the output chamber. This air acts on the

diaphragm and also passes out through the output port.

Since the effective area of the input diaphragm, in this case,

is six times as large as the effective area of the output

diaphragm, it will take six times as much output pressure to

balance the unit. As the increasing output pressure

approaches the balance point, the center assembly will

begin to rise, permitting the valve to close, throttling the

flow of supply air. When the output pressure balances the

input pressure, both surfaces of the valve will be closed and

the relay will be in balance.



A further increase in the input pressure will cause the lower

portion of the valve to open until the output pressure again

equals the input pressure. A decrease in input pressure will

allow the output pressure to force the center assembly

upward, opening the exhaust valve until the output pressure

is equal to the input pressure.



TYPICAL APPLICATION


Increase signal range from controller to control valve

which requires higher pressure at valve.



Replaces Part Numbers:

CR-101-A4
CR101-A4
CR101A4
CR100-A4
CR100A4
CR-100-A4
CARCR100A4



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