5
®
MOUNTING PRESSURE SENSORS
Note: Refer to Figure 4.
1.
The steam pressure sensors (BLPS-15, -25, -30, -200, -300) provide a 1/4” NPT male fitting for
connection to the steam header. Included is a 1/4” coupling.
2.
Make sure the boiler is shut down and zero steam pressure exists in the boiler vessel.
3.
Disconnect power to the boiler controller so the boiler cannot sequence during installation of the
steam pressure sensor.
4.
Always mount the steam pressure sensor
above the water line
of the boiler.
5.
Locate the pressure sensors where the ambient temperature will not exceed 185F
FIGURE 4.
6.
Although the unit can withstand substantial vibration without damage or significant output
effects, it is good practice to mount the pressure sensor where there is minimum vibration.
7.
A steam trap (siphon loop)
must be connected
between the boiler and the pressure sensor to pre-
vent boiler scale and corrosive vapors from affecting the pressure sensor element.
8.
Use only a small amount of pipe compound to seal the connection joints. Excess pipe compound
may clog the fitting and prevent proper operation of the sensor.
9.
Make all pipe connections in accordance with approved standards.
10.
When tightening the sensor, apply a wrench to the hex flats located just above the pressure fit-
ting.
DO NOT
tighten by using a pipe wrench on the housing. Do not tighten the pressure sensor
by hand.
MOUNTING TEMPERATURE SENSORS
The immersion style temperature sensors have a ½" NPT mounting for the 2", 4" and 8" thermowell
probes, and a ½" conduit fitting.
HOT WATER
Note: Refer to Figure 4
1.
Disconnect power to the boiler controller so the boiler cannot sequence during installation of the
hot water temperature sensor.
2.
The thermowell must be mounted where it is always exposed to the circulation of the hot water
3.
If the water system is full, drain the system below the point where the thermowell will be
installed.
4.
Tap an appropriate size fitting. (2", 4" and 8" thermowell have ½"NPT fitting).
5.
Insert the appropriate thermowell (2", 4", or 8") and tighten.
6.
Fill the system to check for leakage.
WARNING: The electro-mechanical high steam limit and/or high hot water temperature
limit MUST REMAIN in the running interlock circuit of the flame safeguard control.
STEAM PRESSURE
OR HOT WATER SENSOR
ELECTRO-MECHANICAL
HIGH LIMIT
(STEAM OR WATER)
