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

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Calibration 82 Clinical syringe ∅p filter Calibrating a filter monitor Use a clinical syringe to check the filter monitor as follows: Method: ■ Switch off the system. ■ Disconnect the differential pressure tubes (+ and –) from the pressure-tapping points. Connect the syringe and a manometer (U-tube) to the “+” side. ■ Switch on the system. ■ Gradually increase the pressure with the syringe until the manometer shows that the switching point has been reached. ■ The alarm device should trip at this point. (Recalibrate if necessary.) ■ Switch off the system. ■ Re-connect the differential pressure tubes. ■ Switch on the plant again.
Practical tips Frost protection thermostats Purpose: Frost protection thermostats are designed to prevent water-filled heat exchangers from freezing. Method: The air-side frost temperature must be monitored with a capillary sensor. Construction Function System Force/deflection The capillary frost-protection sensor operates on the principle of vapour pressure condensation. If the temperature falls below the preset switching point of 2 °C at any point along any 10 cm length, the vapour pressure in the sensor system drops, causing the frost alarm to trip. Practical tips 83
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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
Page 39 and 40: Temperature Surface-mounted strap-o
Page 41 and 42: 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: Calibration of measuring sensors Th
Page 93 and 94: Preventive frost protection thermos
Page 95 and 96: Pressure control in VAV systems The
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