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Terminals
1 =  Power In (+) -- Either Mains 230v (110v USA) or 24vac or 24vdc (Recessed position on PCB)
2 =  Power In (-) -- Either Mains 230v (110v USA) or 24vac or 24vdc (Recessed position on PCB)

3 =  Sensor Flow -- Brown 
4 =  Sensor Flow -- Green 
5 =  Sensor Flow -- Blue 
6 =  Flow Meter 1 (+)    (The red led on front of case flashes when it is in receipt of a pulse from the flow meter)
7 =  Flow Meter 1 (-)
8 =  Pulsed Output 1   (+)
9 =  Pulsed Output 1   (-)
10* = Analog Supply (Active) 1  Active (HCM4004 only)
11* = Common Signal  (4 - 20 mA)  2  HCM4004 Only
12* = Analog Supply (Passive)  -- HCM4004 Only
13 = CAT Terminal 1 (+)   cat terminal details
14 = CAT Terminal 2 (-)
15 = Pulsed Output 2 (+) -- HCM4001 Only
16 = Pulsed Output 2 (-) -- HCM4001 Only
17 = Flow Meter 2 (+) -- HCM4002 Only
18 = Flow Meter 2 (-) -- HCM4002 Only
19 = Sensor Return -- Brown 
20 = Sensor Return -- Green
21 = Sensor Return -- Blue

4-20mA signals Active -- The most common format (outward signal) use 10 & 11
4-20mA signals Passive -- (Inward signal) use 11 & 12

Terminals are numbered on the wiring block -- 
A wiring diagram is despatched with each HCM4

It is recommended as good electrical standard to fuse the electrical input 
with a 3amp fuse -- to conform to IEE standards
Maximum cable diameter useable on terminals 2.5mm