Complexes have different modifications depending on:

- diameter of the conditional pass;

- upper limit of the unconverted flowrate measurement range;

- dynamic range of measurement;

- version by error of conversion of unconverted volume of gas to standard conditions;

- measurement range of absolute (excess) pressure;

- execution: right (flow direction from right to left), left (flow direction from left to right).

On request, the complexes can be manufactured without pressure transducers. In this case, the measured gas volume is converted to standard conditions using the substitutional pressure values agreed between the supplier and the consumer.