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Powers™ Controls

Technical Instructions

Document No. 155-119P25

RC 195-4

April 10, 2005

RC 195 Single Input

Receiver-Controller

Siemens Industry, Inc.

Description

The RC 195 Single lnput Receiver-Controller is a pneumatic instrument which receives

one pneumatic input, either direct acting (DA) or reverse acting (RA). It produces a

pneumatic control signal based on the net pneumatic input and the mechanical settings

of the setpoint and percent proportional band.

Features

• Plug-in air connections make connecting, calibrating and servicing easy.

• lnternal restrictors provided for transmitter inputs.

• Stick-on scales for setpoint dial in standard transmitter ranges in both English and

metric units.

• Large, easy-to-read scales on all adjustments.

• Tamper resistant cover.

Application

The RC 195 Single lnput Receiver-Controller is a one input (direct acting or reverse

acting) instrument. lt is commonly used to control temperatures, humidity, and

pressures of mechanical equipment in commercial buildings, such as offices, hospitals,

universities, and schools.

Product Number

Single lnput Receiver-Controller 195-0011

with case and stick-on DA and RA scales (see Table 1).

Summary of content (10 pages)

PAGE 1
Technical Instructions Document No. 155-119P25 RC 195-4 April 10, 2005 Powers™ Controls RC 195 Single Input Receiver-Controller Description The RC 195 Single lnput Receiver-Controller is a pneumatic instrument which receives one pneumatic input, either direct acting (DA) or reverse acting (RA). It produces a pneumatic control signal based on the net pneumatic input and the mechanical settings of the setpoint and percent proportional band.
PAGE 2
Technical Instructions Document Number 155-119P25 April 10, 2005 RC 195 Single Input Receiver-Controller Table 1. Scale Ranges. English –40 to 120°F 50 to 100°F 80 to 240°F 20 to 80% rh 0 to 100°F 35° to 135°F 0 to 3 lWG 0 to 15 lWG 0 to 0.5 lWG Blank 10 divisions Blank 16 divisions –0.05 to 0.20 lWG –0.5 to 0.
PAGE 3
RC 195 Single Input Receiver-Controller Technical Instructions Document Number 155-119P25 April 10, 2005 Accessories Plug for Control Pressure Gauge Hole Control Pressure Gauge Restrictor Kit Connector Kit RC 195 Pressure Simulator Receiver-Controller Calibration Slide Rule Scale Conversion Card (Form) Operation The control pressure depends upon the position of the main lever which is determined by the sum of the forces acting upon it.
PAGE 4
Technical Instructions Document Number 155-119P25 April 10, 2005 Operation, Continued Percent Proportional Band Installation General RC 195 Single Input Receiver-Controller The pilot relay amplifies the nozzle pressure to provide the control pressure output. Control pressure goes to the controlled device(s) as well as the percent proportional band chamber to provide proportional feedback.
PAGE 5
RC 195 Single Input Receiver-Controller Installation, Continued Technical Instructions Document Number 155-119P25 April 10, 2005 4. Check all the air connections particularly those to the transmitter to eliminate leaks. Even small leaks in the pneumatic lines to the transmitters will introduce large errors. 5. Check the supply pressure. The supply pressure must be a constant 22 psi (152 kPa). If it is different or if a dual air supply is used, error will be introduced into the transmitted signal.
PAGE 6
Technical Instructions Document Number 155-119P25 April 10, 2005 RC 195 Single Input Receiver-Controller Installation, Continued Figure 5. Maximum Distances for External Restrictors and Remote Gauges. Generally, 1/4-inch (6.4 mm) OD plastic tubing should be used for all the connections to the plug-in air connectors. Larger size tubing will reduce the pressure drops, but it will increase time delays. Conversely, smaller tubing will reduce time delays but will increase pressure drops.
PAGE 7
RC 195 Single Input Receiver-Controller Calibration, Continued Technical Instructions Document Number 155-119P25 April 10, 2005 Step 1 Determine Percent Proportional Band setting using Table 2 or Formula A. Table 2. Percent Proportional Band Settings.
PAGE 8
Technical Instructions Document Number 155-119P25 April 10, 2005 Calibration, Continued RC 195 Single Input Receiver-Controller Step 3 Record data from Steps 1 and 2 on Control Schematic. 1. Set the proportional band pointer to value shown on control drawing. 2. Apply setpoint pressure to selected input (#1/DA or #2/RA) and with a screwdriver turn the setpoint adjustment screw until control pressure reaches 8 psi (55 kPa) or midpoint pressure of the spring range of actuator. 3.
PAGE 9
RC 195 Single Input Receiver-Controller Technical Instructions Document Number 155-119P25 April 10, 2005 Troubleshooting, Continued Figure 7. Output Pressure/Transmitter Range Relationship In English Units. Figure 8. Output Pressure/Transmitter Range Relationship in Metric Units. Siemens Industry, Inc.
PAGE 10
Technical Instructions Document Number 155-119P25 April 10, 2005 RC 195 Single Input Receiver-Controller Dimensions Figure 9. Dimensions. Information in this publication is based on current specifications. The company reserves the right to make changes in specifications and models as design improvements are introduced. Powers is a registered trademark of Siemens Industry, Inc. Product or company names mentioned herein may be the trademarks of their respective owners. © 2005 Siemens Industry, Inc.