Kamstrup MULTICAL 803, Техническое описание, Страница: 47 / 171

MULTICAL® 803
Kamstrup A/S · Technical description · 5512-2360_A1_GB_02.2019 47
3.4.9 Leakage limits (V1, V2) >M<
MULTICAL® 803 can be used for leakage monitoring when two flow sensors are connected to MULTICAL® 803 on
inputs V1 and V2.
The M code defines the leakage limit, i.e. the leakage monitoring sensibility. If a leakage is detected in the system,
the info code for leakage or burst is activated, depending on the size of the leakage. The leakage search is based on a
difference in mass (ΔMass) between the calculated mass for V1 and V2, respectively. The calculation of this
difference in mass is carried out over 24 hours why the reaction time of the info code for leakage is 24 hours. The
burst search is based on a difference in flow for V1 and V2, respectively. The burst search is performed over a period
of 120 seconds. Read more about these info codes in the info code overview in paragraph 7.8.
The sensibility of a leakage can be adjusted via the M code while the sensibility of a burst is fixed. This also appears
from the table of the M code below. It is possible to detect leakages down to 15 kg/h with the connection of two
flow sensors of qp 1.5 m³/h. Both the info code for leakage and for burst can be disabled via the M code (M = 0).
Leakage limits (V1, V2) M code
Leakage Burst
No active leak search No active burst search 0
ΔMass ≈ > 1.0 % of qp + 20 % q Δflow > 20 % of qp 1
ΔMass ≈ > 1.0 % of qp + 10 % q Δflow > 20 % of qp 2
ΔMass ≈ > 0.5 % of qp + 20 % q Δflow > 20 % of qp 3
ΔMass ≈ > 0.5 % of qp + 10 % q Δflow > 20 % of qp 4
Permanent operational monitoring
Leakage monitoring can with advantage be extended to include permanent performance monitoring as it just
requires the installation of a set of three sensors instead of a sensor pair. In Denmark, for example, permanent
performance monitoring reduces the number of random samples to three meters per random sampling lot, no
matter the size of the measuring lot. Read more in the permanent performance monitoring guide (5512-1486_GB).
The purpose of this guide is to provide caretakers, installers and consulting engineers with the information needed
on Kamstrup's leak monitoring system and permanent performance monitoring.
0
20
40
60
80
100
120
140
160
180
0 150 300 450 600 750 900 1050 1200 1350 1500
Sensibility
(∆flow ≈ ∆Mass)
[l/h ≈ kg/h ]
Average flow per day (q)
[l/h]
Leakage limit for qp 1.5 m³/h
M code = 2 (1.0 % of qp + 10 % q)