Spirax Sarco RIM20, Инструкция по установке и обслуживанию, Страница: 32 / 132

IM-P198-05 MI Issue 2 32
R current limit - 10 k
DC power
DC common
Freq. Out +
Freq. Out -
+ Pwr Bklt
- Pwr Bklt
Freq. Out voltage = +V
Select resistor so that current through pulse  40 mA
3.16 Frequency output connections
The frequency output is used for a remote counter. It can be scaled to output a 1 to 10 kHz
signal proportional to mass or volume flow, temperature, pressure or density.
The frequency output requires a separate 5 to 36 Vdc power supply; however, there are
current and power specifications that must be observed.
The output can conduct a current up to 40 mA and can dissipate up to 200 mW. The output
is isolated from the meter electronics and power supply.
Fig. 19 Non-Isolated frequency output using external power supply
3.17 Optional backlight connection
The loop power meter has an optional backlight connection provided. It is intended to be
powered by a separate 12 to 36 Vdc at 35 mA max. power supply or by the pulse power input.
Both options are shown below.
Fig. 20 Backlight using external power supply
12 to 36 VDC
25 mA max.
+ Pwr Bklt
- Pwr Bklt
12 to 36 Vdc
25 mA max.
Fig. 18 Isolated pulse output using external power
+V
R current limit - 10 k
Freq. Out +
Freq. Out -
Pulse voltage = +V
Select resistor so that current
through pulse  40 mA
dc power
dc common
Freq. Out +
Freq. Out -
Freq. Out +
Freq. Out -
Freq. Out voltage = +V
Select resistor so that current through pulse  40 mA
R current limit - 10 k
Pulse voltage = +V
Select resistor so that current
through pulse  40 mA
+ Pwr Bklt
- Pwr Bklt
+ Pwr Bklt
- Pwr Bklt