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Technical Instructions
Document No. 155-071P25
TH 357-1
September 24, 2004
TH 357 Limitem Remote Bulb
Thermostat
Description
The TH 357 Limitem is a gradual-direct acting thermostat for air temperature control.
This pneumatically operated instrument senses a temperature and passes on a
pneumatic signal whose pressure is proportional to the temperature sensed. The
sensing element is liquid filled, and is available in remote and averaging bulb styles.
Features
Two-valve design eliminates wasting air
Rapid response to temperature change
Adjustable sensitivity
Application
The TH 357 Limitem can be used to control air temperatures in a variety of air handling
units. Typical applications are as primary controller for an air handling unit or a low limit
control.
Table 1. Product Numbers.
Specifications
Sensing
Element
Operating
Range
Bulb Capillary Max. Ambient
Temp. of Bulb
Sensitivity
Adjustable
Product
Number
20 to 100°F
(-6.7 to 37.8°C)
3/8 in. × 4.0 in.
(0.95 × 10.2 cm)
8.0 ft (2.4 m) 201°F
(94°C)
1/3 to 3-1/2 psi/°F
(4 to 43 kPa per °C)
357-0003Liquid Filled
Remote
Bulb
120 to 230°F
(48.9 to 110°C)
3/8 in. × 4.0 in.
(0.95 × 10.2 cm)
40.0 ft (12.2 m) 261°F
(127°C)
1/3 to 2-1/4 psi/°F
(4 to 28 kPa per °C)
357-0005
35 to 145°F
(1.7 to 62.8°C)
3/32 in. × 15 ft
(0.24 × 457 cm)
40.0 ft (12.2 m) 210°F
(99°C)
1/3 to 2-1/4 psi/°F
(4 to 28 kPa per °C)
357-0004Liquid Filled
Averaging
Bulb
35 to 145°F
(1.7 to 62.8°C)
3/32 in. × 8 ft
(0.24 × 244 cm)
0.5 ft (15 cm) 211°F
(99.4°C)
1/3 to 3-1/2 psi/°F
(4 to 43 kPa per °C)
357-0001
Siemens Building Technologies, Inc.

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