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140-072011 200/202 Series Page 6 of 24
1.4. Optional 4-20 mA Current Output
An option to the standard 0 - 5 VDC output is the 4 - 20 mA current output that is proportional to
flow. The 4 - 20 mA signal is produced from the 0 - 5 VDC output of the flow meter. The current loop
output is useful for remote applications where pickup noise could substantially affect the stability of the
voltage output or long cable runs where cable resistance would cause a voltage signal to decay.
The current loop signal replaces the voltage output on pin 6 of the DA-15 connector (pin 2 of DE-9 24
Volt). The current loop is sourced internally from the +15 VDC supply and must be returned to the
signal supply common after (pin 5 [±15 VDC] or pin 8 [24 VDC]) passing through the monitoring
circuitry to complete the loop. The load must be between 0 and 600 Ohm.
The 4-20 mA I/O option can accept a current input for flow controllers. The 0-5 VDC command
signal on pin 14 / (pin 3 for 24 Volts) can be replaced by a 4 - 20mA command signal. The loop presents
an impedance of 50 Ohms and is returned to the signal common. On the 24 Volt units, the signal
common will need to be tied to the power supply common external to the flow controller to complete the
loop since the signal common is galvanically isolated internally from the supply common. This line must
be current limited (< 50 mA) to prevent short circuit currents from damaging the receiving circuit in the
flow controller.
1.5. Other Accessories
1.5.1. Hastings Power supplies
Hastings Power Pod power supply/display units are available in one and four channel versions. They
convert 100, 115 or 230 VAC to the ±15 VDC required to operate the flow meter and provide a digital
indication of the flow rate. Interface terminals for the retransmission of the flow meter analog output
signal are located on the rear of the panel.
The Power Pod 100 and 400 models are built with controllers in mind but will work with meters as well.
The Model 40 is for flow meters only. Throughout this manual, when reference is made to a power
supply, it is assumed the customer is using a Hastings power supply. Hastings PowerPod-100 and
PowerPod-400 power supplies are CE marked, but the Model 40 does not meet CE standards at this
time. The Model 40 and PowerPod-100 are not compatible with 4 – 20 mA analog signals. With the
PowerPod 400, individual channels’ input signals, as well as their commands, become 4 – 20 mA
compatible when selected. The PowerPod-400 also sports a Totalizer feature. More information about
the Power Pods can be found on the Hastings web site. http://www.teledyne-hi.com/products/powerpod-
series.htm
±15 Volt Supply
24 Volt Supply