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Pin #
2.6. Operation
The standard instrument output is a 0 - 5 VDC out and the signal is proportional to the flow i.e.,
volts = zero flow and 5 volts = 100% of rated flow. The 4 - 20 mA option is also proportional to flow, 4
mA = zero flow and 20 mA = 100% of rated flow.
2.6.1. Operating Conditions
For proper operation, the combination of ambient temperature and gas temperature must be such that
the flow meter temperature remains between -20 and 70°C. (Most accurate measurement of flow will
be obtained if the flow meter is zeroed at operating temperature as temperature shifts result in some
zero offset.) The Hastings 300 series instrument is intended for use in non-condensing environments
only. Condensate or any other liquids which enter the flow meter may destroy its electronic
components.
Manual: 151-032015 300-302 Series
Fig. 2.1
Figures 2.1/2.2, and Tables 2.1/2.2, show the 300/302 pin out.
Table 2.1
"U" Pin-Out
1
Signal Common
2
Do not use
3
Do not use
4
+15 VDC
5
6
Output 0-5 VDC (4-20mA)
7
Signal Common
8
Case Ground
9
Valve Override
10
11
-15VDC
12
External Input
13
Signal Common
14
Signal Common
15
Set Point 0-5 VDC (4-20mA)
Table 2.2
"H" Pin-Out
Pin #
1
Do not use
2
Do not use
3
Do not use
4
Do not use
5
Signal Common
6
Output 0-5 VDC (4-20mA)
7
Case Ground
8
Valve Override
9
-15VDC
10
Do not use
11
+15VDC
12
Signal Common
13
External Input
14
Set Point 0-5 VDC (4-20mA)
15
Do not use
Fig. 2.2
0
Page 9 of 22
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