Siemens LMV5 Series Technical Instructions page 19

LMV Series
Temperature Sensors – Qty (1) Required for Hot Water Boilers, Optional for Other Applications
One temperature sensor is needed to measure water temperature on hot water boilers.
Additionally, one may be needed for low fire hold on a steam boiler, hot standby on a steam
boiler, or ambient and stack temperatures for efficiency calculations or FGR hold features. The
most commonly used temperature sensors are listed below. For a list of all temperature sensor
options as well as technical instructions for all available temperature sensors, refer to
Document No. SEN-1000.
QAE2020.001
QAE2012.001
QAE2012.9002
QAC22
QAM-P210
SCC Inc.
Sensors (continued)
100 Ohm, 3-wire, platinum RTD used to measure
water temperature on hot water boilers
Range: -4 to 374 °F
1000 Ohm, 2-wire, platinum RTD used to measure
water temperature for low fire hold or hot standby
on steam boilers. Also recommended to measure
ambient air temperature for LMV52.4 applications
Range: -4 to 374 °F
1000 Ohm, 2-wire, platinum RTD used to measure
water temperature on hot oil heaters and steam
boilers operating over 150 PSI
Range: -50 to 900 °F
1000 Ohm, 2-wire, nickel RTD used to measure
ambient air temperature (required for efficiency
calculations)
Range: -58 to 158 °F
1000 Ohm, 2-wire, platinum RTD used to measure
flue gas temperature (required for efficiency
calculations and FGR low temperature hold features)
Range: -50 to 900 °F
Page 15
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Technical Instructions
Document No. LV5-1000
Section 1