Steam traps

Steam trap management

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.

Trap status

Trap operating correctly

Trap leaking steam

Trap blocked or waterlogged

Trap cold, but free of condensate

(or R1C failure)

Analogue output:

R1C digital outputs

Waterlogged

On

On

Off

Off

Steam leak

On

Off

On

Off

Trap status

Trap operating correctly

Trap leaking steam

Trap blocked or waterlogged

Trap cold, but free of condensate

(or R1C failure)

Nominal output

current from R1C

Recommended BEMS/EMS

alarm threshold settings

23.0 mA > set point > 17.5 mA

17.5 mA > set point > 12.5 mA

12.5 mA > set point > 7.5 mA

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:

20 mA

15 mA

10 mA

4 mA

7.5 mA

There are no user serviceable parts in the R1C.

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)

> 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.

Maintenance

Dimensions (approximate) in millimetres

M20 x 1.5 - 6 H

109

35

Ø 25.4

66

TI-P087-32 MI Issue 4

R1C Steam Trap Failure Monitor

5.1.8