Varec 2920 - Explosion Proof and I.S. HART

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4 Wiring

Varec, Inc. 27

At the top of every wiring diagram is the list for that particular order code.

Here’s a breakdown of what each column means:

1. Name of the product

2. Approval (AT = ATEX/IECEx, FC = cFMus -40°C, FM = -20/25°C cFMus)

3. Power (1 = DC, 2 = AC)

4. Communications board (BP = Bi-Phase Mark, MB = RS-485 MODBUS, MS = Mark/Space, LJ

= L&J TankWay)

5. Limit Switch (Number of limit switches: 0 = 0 LS, 1 = 2 LS, 2 = 4 LS)

6. Limit Switch Range (N = NA if column d = 0, A = 0-25 ft LS range, B = 0-50 ft LS range, C =

0-100 ft LS range, D = 0-7.5 m LS range, E = 0-15 m LS range, F = 0-30 m LS range)

7. Additional Digital Inputs/Outputs (0 = no additional DIDO, 1 = additional DIDO)

8. Analog Inputs/Outputs (N = no analog I/O, A = analog input, B = analog outputs, C = analog

inputs and outputs)

9. HART (0 = Explosion-proof HART, 1 = I.S. HART)

10. Display Orientation (A = forward facing display, B = backwards facing display, C = right-side

facing display)

Explosion Proof and I.S. HART

Varec optionally provides an Intrinsically Safe (I.S.) HART I/O to be used with I.S. field devices,

such as radars and temperature transmitters. I.S. HART models have a separate I.S. junction

box for field terminations. Models that do not have I.S. HART have explosion-proof HART I/O

denoted as HART+ and HART- on TB5 on the main terminal board with the display (as shown

on the left below). Explosion-proof I/O can only be used with explosion-proof field devices. I.S.

HART models have L and H terminals on TB5 (as shown on the right below). The L & H terminals

are for future functionality and are not used at this time.

1 2 (aa) 3 (b) 4 (cc) 5 (d) 6 (e) 7 (f) 8 (g) 9 (h) 10 (i)

N2920