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300-302 Series Page 6 of 31
The 4-20 mA I/O option can accept a current input. The 0-5 VDC command signal on pin 14 can be
replaced by a 4-20mA command signal. The loop presets an impedance of 75 ohms and is returned to
the power supply through the valve common.
1.4. Other Accessories
1.4.1. Hastings Power Supplies
Hastings power supplies are available in one or four channel versions. They convert 115 or 230 VAC to
the ±15 VDC required to operate the flow meter. Interface terminals for the ±15 VDC input and the 0-5
VDC linear output signal are located on the rear of the panel. Throughout this manual, when reference
is made to a power supply, it is assumed the customer is using a Hastings 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, is
become 4–20 mA
compatible when selected. The PowerPod-400 also provides a totalizer feature.
1.4.2. 300/302 Series Power Supply Interface Cables
The Hastings 300 series normally comes with the standard “H” pin-out connector, which uses the AF-8-
AM cable with grey backshells. “U” pin-out versions of the 300 series instruments require a different
cable to connect to the Hastings Instruments power supply. This cable is identifiable by black backshell
and is available as Hastings Instrument P/N 65-791.