Sensor Installation Handbook Preface 3rd edition - Siemens ...

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Practical tips 86 The stabilised start function and setpoint-regulated start-up control are used if there are additional heat exchangers (heat stores) installed downstream of the preheater. Stabilised start function: The stabilised start function maintains the air downstream of the heating coil at a minimum temperature. To achieve this, an averaging sensor must be installed directly adjacent to the frost-thermostat capillary. The minimum-temperature controller can be set independently of the frost thermostat and acts directly on the preheater valve. A: Selector function Setpoint-regulated start-up control: Setpoint-regulated start-up control requires an averaging sensor, installed directly adjacent to the frost-thermostat capillary. If its temperature falls below the value selected on the out-of-limits sensor, the latter adjusts the setpoint used for control of the supply air. Setpoint Supply air 2 Break point for start-up sensor Supply air 1
Pressure control in VAV systems The sensing point must be sited at the most remote point in the duct system. In duct systems with a large number of branches, the use of several sensing points is recommended (the lowest pressure is used for control). If some parts of the ductwork (zones) are shut off by dampers, the relevant sensors must be disconnected. The setpoint can only be maintained at the sensing point. Practical tips 87
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Sensor Installation Handbook Prefac
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Sensor Installation Handbook Prefac
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General notes for all sensors Alway
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Always allow a sufficient length of
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Temperature Immersion sensors · Wa
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Water-resistant seal Chilled water
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If the active length (a) of the sen
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Sensors mounted without immersion p
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Temperature Probe sensors · Air En
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The ambient temperature at the devi
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Temperature Averaging sensors Allow
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Do not bend the capillary too tight
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When installing on "drawer"-type un
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Use spacing clips to maintain a 50
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Do not install on external walls. A
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Temperature Outdoor sensors The sys
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Seal gaps between cable/plastic tub
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Temperature Surface-mounted strap-o
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Temperature Wind sensors Install on
Page 43 and 44: Avoid shade (from trees or neighbou
Page 45 and 46: A test hole must be provided for ev
Page 47 and 48: Distance for adiabatic humidificati
Page 49 and 50: Humidity sensor Average humidity me
Page 51 and 52: Seal gaps between cable/plastic tub
Page 53 and 54: Where there is a risk of condensati
Page 55 and 56: Avoid using tips which protrude int
Page 57 and 58: Where more than one sensor is used,
Page 59 and 60: Pressure Liquids Pressure tapping p
Page 61 and 62: Pressure measurement in conjunction
Page 63 and 64: Flow monitoring Water Correct insta
Page 65 and 66: Avoid recesses (e.g. shelving) and
Page 67 and 68: Floats: These are used in open and
Page 69 and 70: Principles of operation General All
Page 71 and 72: Example of response characteristic
Page 73 and 74: Stepless devices Stepless devices (
Page 75 and 76: Bimetal rod and tube Material Const
Page 77 and 78: Electrical resistance sensors Metal
Page 79 and 80: Thermocouples These consist of two
Page 81 and 82: Absolute humidity x g H 2O per kg o
Page 83 and 84: Electronic systems Piezoelectric el
Page 85 and 86: Measuring water velocity and flow L
Page 87 and 88: Room temperature measurement Room s
Page 89 and 90: Calibration of measuring sensors Th
Page 91 and 92: Practical tips Frost protection the
Page 93: Preventive frost protection thermos
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Sensor Installation Handbook Preface 3rd edition - Siemens ...

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