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Technical Instructions

Document No. 155-077P25

TT 184-1

February 15, 2022

TT 184 Temperature Transmitters

Room Transmitter

Remote Bulb

Average Bulb

Rigid Bulb

Siemens Industry, Inc.

Description

The TT 184 Temperature Transmitters are direct acting, one-pipe instruments that

sense temperature and transmit a proportional pneumatic signal. Normally, this signal

is transmitted to a remotely located receiver gauge and/or receiver-controller. The

receiver gauge would be calibrated to read directly in temperature.

Features

• Rapid response to temperature changes over their full range

• lnternal feedback for excellent linearity and accuracy

• Variety of sensing elements and temperature ranges

Application

The temperature transmitters are ideal for applications requiring indication with a

receiver gauge and/or control with a receiver-controller.

Product Numbers

See Table 1.

Specifications

Operating

Action Direct acting

Output air pressure 3 to 15 psi (21 to 103 kPa)

Ambient temperature range 40 to 120°F (4.4 to 49°C)

lnput (supply) air pressure:

Restrictor size 40 scim (11 ml/s)

Calibration Pressure 22 ± 1.0 psig (152 ± 6.9 kPa)

Maximum 30 psig (207 kPa)

Thermal system:

Room Bimetal

Rigid bulb Rod and tube

Remote bulb Liquid filled

Air consumption 35 scim (10 ml/s)

Summary of content (10 pages)

PAGE 1
Technical Instructions Document No. 155-077P25 TT 184-1 February 15, 2022 Powers™ Controls TT 184 Temperature Transmitters Room Transmitter Remote Bulb Average Bulb Rigid Bulb Description The TT 184 Temperature Transmitters are direct acting, one-pipe instruments that sense temperature and transmit a proportional pneumatic signal. Normally, this signal is transmitted to a remotely located receiver gauge and/or receiver-controller.
PAGE 2
Technical Instructions Document Number 155-077P25 February 15, 2022 TT 184 Temperature Transmitters Mounting: Room Rigid bulb Remote bulb Specifications, Continued Physical Wall terminal Mounting flange Mounting flange or well bracket mounting kit Mounting flange 1/8-inch NPT Averaging bulb Air connection Cover finish: Room Rigid, averaging and remote bulb Well Desert beige Gray See Table 2 Table 1. Product Numbers.
PAGE 3
TT 184 Temperature Transmitters Operation Technical Instructions Document Number 155-077P25 February 15, 2022 The transmitter is provided with a restricted (40 scim) supply of air. Assume a rise in temperature at the transmitter sensing element. The free end of the bimetal, the rod and tube, or the liquid-filled element moves downward. This increases the load on the throttling pin (or throttling ball) and moves it closer to the nozzle.
PAGE 4
Technical Instructions Document Number 155-077P25 February 15, 2022 Installation Room Transmitters TT 184 Temperature Transmitters • Temperature transmitters may be mounted in any position on a vertical surface. • Installation may be made inside or outside of ducts and near fans, compressors, ducts, and air conditioning equipment. Transmitters, generally, are not affected by light vibration. Room transmitter mounting is shown in Figure 4.
PAGE 5
TT 184 Temperature Transmitters Installation, Continued Rigid Bulb Technical Instructions Document Number 155-077P25 February 15, 2022 Rigid bulb transmitter mounting is shown in Figure 5. The transmitter is secured to the flange by a set screw. The dimensions of the rigid bulb transmitter are shown in Figure 14. When installing rigid bulb temperature transmitters on insulated ducts, the insulation must not cover any portion of the bulb (Figure 11).
PAGE 6
Technical Instructions Document Number 155-077P25 February 15, 2022 TT 184 Temperature Transmitters Installation, Continued Figure 6. Remote Bulb Mounting. Figure 7. Remote Bulb Mounting in a Well. Page 6 Siemens Industry, Inc.
PAGE 7
TT 184 Temperature Transmitters Technical Instructions Document Number 155-077P25 February 15, 2022 Installation, Continued Figure 8. Typical Connections. Components Table 3. Room Transmitter Parts (Figure 9). Item Part No. 1 – 2 Part Name No. Req'd. Material Nozzle 1 Brass – Guard 1 Brass 3 – Ball & stem assembly 1 Stainless steel 4 – Bimetal & spring assembly 1 – 5 – Mounting screw 2 Brass 6 – Cover screw 2 Stainless steel 7 833-009 Seal screw 1 Bronze Figure 9.
PAGE 8
Technical Instructions Document Number 155-077P25 February 15, 2022 TT 184 Temperature Transmitters Figure 10. Installation on Insulated Ducts. Installation, Continued Table 4. Rigid and Remote Bulb Parts (See Figure 11 and Figure 12. Remote Bulb.). Item Part No.
PAGE 9
TT 184 Temperature Transmitters Calibration Technical Instructions Document Number 155-077P25 February 15, 2022 Because of variations in lengths of pneumatic tubing, airflow through restrictors, ambient temperatures, etc., there will be small errors between actual temperature at sensing element and gauge indication. Adjusting the pointer on the receiver gauge to agree with the temperature at the sensing element will result in greater accuracy. Additional suggestions are given in the Table 5.
PAGE 10
Technical Instructions Document Number 155-077P25 February 15, 2022 TT 184 Temperature Transmitters Dimensions Dimensions in Inches (Millimeters) Figure 13. Dimensions of the Rigid Bulb and Remote Bulb Transmitters. (Bulb Not Shown. See Table 1). Figure 14. Dimensions of the Room Transmitter. 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.