The Measuring Instruments (Non-Prescribed Instruments) Regulations 2006

Discontinuous Totalisers

48.—(1) In addition to the requirements set out in paragraphs 44 and 45, the following specific requirements shall apply in relation to discontinuous totalisers.

(2) Accuracy Classes

Discontinuous totalisers are divided into four accuracy classes, as follows—

(i) 0.2;

(ii) 0.5;

(iii) 1; and

(iv) 2.

(3) MPE

Table 12

Accuracy class	MPE of Totalised load
0.2	± %
0.5	± %
1	± %
2	± %

(4) Totalisation scale interval

The totalisation scale interval (d_t) shall be in the range:

• 0.01 % Max ≤ d_t ≤ % Max

(5) Minimum Totalised Load (Σ_min)

The minimum totalised load (Σ_min) shall be not less than the load at which the MPE is equal to the totalisation scale interval (d_t) and not less than the minimum load as specified by the manufacturer.

(6) Zero Setting

Instruments that do not tare weigh after each discharge shall have a zero setting device. Automatic operation shall be inhibited if zero indication varies by—

(a) 1 d_t on instruments with automatic zero setting device; or

(b) 0.5 d_t on instruments with a semi-automatic, or non-automatic, zero setting device.

(7) Operator Interface

Operator adjustments and reset function shall be inhibited during automatic operation.

(8) Printout

On instruments equipped with a printing device, the reset of the total shall be inhibited until the total is printed. The printout of the total shall occur if automatic operation is interrupted.

(9) Performance under influence factors and electromagnetic disturbances

(a) The MPE due to influence factors shall be as specified in Table 13.

Table 13

Load (m) in totalisation scale intervals dt	MPE
0 < m ≤ 500	± dt
500 < m ≤ 2 000	± dt
2 000 < m ≤ 10 000	± dt

(b) The critical change value due to a disturbance is one totalisation scale interval for any weight indication and any stored total.