Steam traps Steam trap management
8
Output signals for remote indication of trap status Digital outputs PNP open collector output
Use this output to connect the R1C to a BEMS / EMS whose digital inputs are pulled down to 0 volts. The pnp outputs act like switches connected to the R1C's power supply. During normal trap operation, the pnp outputs will switch ON and give out a voltage equal to the R1C's power supply minus 0.4 V. Their output resistance in this state is 220 ohms. If the trap fails, one of the pnp digital outputs will switch OFF. NPN open collector outputs Use this output option to connect the R1C to a BEMS / EMS whose digital inputs are pulled up to a positive voltage. The npn outputs act like switches connected to 0 volts. During normal trap operation, the npn outputs will switch ON, giving out 0 volts with an output resistance of 220 ohms. If the trap fails, one of the npn digital outputs will switch OFF.
R1C digital outputs
Trap status
Waterlogged
Steam leak
Trap operating correctly
On
On
Trap leaking steam
On
Off
Trap blocked or waterlogged
Off
On
Trap cold, but free of condensate (or R1C failure)
Off
Off
Analogue output: An analogue output is available as standard for use with BEMS / EMS's that operate on an analogue input signal. Setting details are given below:
Nominal output current from R1C
Recommended BEMS/ EMS alarm threshold settings
Trap status
5.1.10
Trap operating correctly
20 mA
23.0 mA > set point > 17.5 mA
Trap leaking steam
15 mA
17.5 mA > set point > 12.5 mA
Trap blocked or waterlogged
10 mA
12.5 mA > set point > 7.5 mA
Trap cold, but free of condensate (or R1C failure)
4 mA
7.5 mA > set point > 0 mA
The current output from the R1C is derived from an internally powered loop and is capable of driving into an impedance of at least 550 ohms. In practice, this means that the maximum permissible distance between the R1C and the BEMS / EMS will be governed by the type of connecting cable used.
8.1 9
Dimensions (approximate) in mm (inches)
35 (1.38)
109 (4.29)
M20 x 1.5 - 6 H
25 (1")
66 (2.6)
How to order example 1 - Spirax Sarco R1C Steam trap failure monitor (pnp digital outputs), or 1 - Spirax Sarco R1C Steam trap failure monitor (npn digital outputs)
Maintenance There are no user serviceable parts in the R1C.
TI-P087-32 EMM Issue 5
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R1C Steam Trap Failure Monitor
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