WIKA GDM 233.52.100 TI 帶有變送器的組合型氣體密度表（GDM）

Gas Density Monitor (GDM)
with Integrated Gas Density Transmitter
Model 233.52.100 TI

Gas Density Monitor (GDM) with Integrated Gas Density
Transmitter, Model 233.52.100 TI

Applications
Gas density monitoring of closed SF6 tanks
For indoor and outdoor installation in SF6-gas-isolated switching units

Special Features
Modified bourdon tube pressure gauge with integrated Gas Density Transmitter inside the case
Local readout with alarm contacts
Remote readout (output 4 … 20 mA, 2-wire system),measuring ranges from 0 ... 10 g/liter to 0 ... 80 g/liter
High EMI performance, CE-conformity
Hermetically sealed, therefore no influence by atmospheric pressure fluctuation and differences in altitude

Description - Gas Density Transmitter
Model 233.52.100 TI features a Gas Density Transmitter integrated into the back of the case. It functions fully as a standard GD-10 Gas Density Transmitter, however, the combination allows for both instruments to obtain a density reading through a single connection to the tank.

The gas density transmitter is electrically compensated following the non-linear behavior of SF6-gas according to the virial equation. This provides the highest accuracy and best temperature compensation possible since SF6 is a real gas functioning according to real gas law equations. Only a gas density transmitter can take this into account.

The gas density transmitter picks up the pressure and temperature of the SF6-gas contained in the device (tank).The current gas density is ascertained from both variables by means of an electronic evaluation system. Thermal

induced pressure changes are dynamically compensated and do not affect the output signal.The gas density transmitter generates a density proportional, standardized signal of 4 ... 20 mA.

Recalibration of the zero signal is not necessary due to the high long-term stability of the gas density transmitter. The hermetically-sealed measuring cell guarantees high longterm leak tightness. It is welded closed to prevent leaks and remain independent of atmospheric pressure fluctuations and variations of the mounting height.

The EMI properties of the transmitter are tested according to IEC 61000-4-2 thru IEC 61000-4-6 and guarantee a safe pick-up of the signal which is especially suited to conditions prevailing in high-voltage switching units.

Description - Gas Density Monitor
Nominal size
100 mm dial size with transmitter integrated into special deeper case

Accuracy (relating to the measuring span)
Accuracy of ± 1% at +20 °C/68 °F (± 0.37%/10 °K must be added as the temperature deviates from +20 °C/68 °F)
Reference diagram KALI-Chemie AG
Calibration pressure is used as reference isochore

Scale ranges
All standard ranges and +/- ranges with a measuring span of min. 1.6 bar und max. 25 bar (SF6 gas pressure at +20 °C)

Calibration pressure PE
As ordering specifications

Permissible temperatures
Ambient: -20 ... +60 °C (gas phase)
Storage: -50 ... +60 °C

Alarm contacts / Contact rating
Max. 3 magnetic snap-action contacts, to make or break, with galvanic isolation, switching points nonadjustable and secured
Contact rating: 20 W / 20 VA, max. 1 A
Material of contacts: 80 % Ag / 20 % Ni, gold-plated

Switching accuracy in temperature range -20 ... +60 °C
If switching point is equal PE: as measuring span,
If switching point is not equal PE:
Moved parallel to calibration pressure

High-voltage test
2 kV, 50 Hz, 1 s (wiring versus case)

Electrical connection
Cable box with cable gland M20 x 1.5
Connection cross-section max. 2.5 mm²

Pressure connection
Stainless steel,
Lower mount (LM) only, spigot Ø 6 x 5, similar to EN 837,
G ½ B (male), 22 mm flats

Pressure element
Stainless steel, welded
Gas tight: leakage rate ≤ 1 · 10-8 mbar · l / s
Test method: spectrometry of helium mass

Movement
Stainless steel
Bimetal link (temperature compensation)

Dial
Aluminium, red-green-yellow section as ordering
specifications

Pointer
Aluminium, black

Case

Stainless steel with silicone oil or dry nitrogen filling
Gas tight: leakage rate ≤ 1 · 10-5 mbar · l / s

Window
Laminated safety glass

Bezel ring
Cam ring (bayonet type), stainless steel secured with 3 welding spots

Ingress protection
IP 65 per EN 60 529 / IEC 529

Weight
approx. 1.2 kg

Options - Gas Density Monitor
3 magnetic snap-action contacts, without galvanic
Isolation, switching points are adjustable
Acrylic glass window
Pressure connection through flanges
Pluggable cable box

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