Surefire BMS-350, Installation And Operation Manual

Page: 15 / 56

15
INSTALLATION GUIDE
RTD
1. Install the RTD into the provided thermo-well on the
vessel.
2. Connect the two negative wires to the negative termi-
nals (Ports10-11) on the circuit board.
3. Connect the one positive wire to the positive terminal
(Port 12).
4-20mA
The proper connection method for the 4-20mA remote circuit
monitoring is as follows
1. Ensure there is no power to the BMS-350 or PLC before con-
necting the wires.
2. Connect positive side of the power supply from the remote monitoring
equipment to positive port and the negative wire to the negative port of the
4-20mA terminal.
3.
If a 1-5 V signal is desired instead of the 4-20m, please install a 250 Ω resistor (at the remote moni-
toring equipment) to the return in step 2 and connect the other end of the resistor to the NEG side
of the power supply. Monitor the VDC signal at the 250 Ω resistor (return wire).
RTD Scaling: 4 mA = 0 °F
20 mA= 670 °F
T/C Scaling: 4 mA = 32 °F
20 mA = 2400 °F
PLC/ Scada Connection (Cont.)
Solenoid Valve
1. Ensure instrument gas is shut off.
2. Locate the instrument gas supply line feeding the main burner
valve.
3. Cut the supply tubing, allowing enough room for the solenoid
to be installed in close proximity to the SureFire Controller.
4. Use two 1/4” NPT x 3/8” tubing fittings and connect the
solenoid in-line.
5. Trim the unused GREEN wire short and cap it off with a wire
nut as this will not be used.
6.
Use the proper conduit and connectors and wire the solenoid to the
SureFire system.
Stage 1 Solenoid terminated to ports 8 and 9.
Stage 2 Solenoid terminated to ports 18 and 19.
Note: Reference solenoid body for proper
flow direction. 1 = Outlet 2 = Inlet