The gas density monitor TS continuously monitors the density of the insulating gas SF6. Up to five microswitches inside the device respond reliably to any decreases in the density and pressure of the SF6 insulating gas. The operating points can be set at the factory according to the customer’s requirements.
Key Features
Design
The gas density monitor TS consists of the following principal components:
Operating principle
The density monitor TS monitors gas density by way of a reference chamber filled with SF6 gas. The gas and reference chambers are separated by a metal bellows. A density and pressure difference between the two chambers deflects the metal bellows. The movement of the bellows is transmitted by a switch rod. A switch plate activates the microswitches whose purpose is to indicate a pressure drop.
The operating points for triggering the signal can be set at the factory according to the customer’s requirements by way of lockable screws (plungers). Up to five microswitches with changeover contacts can be installed in the housing. The microswitch contact outputs are taken to terminal tabs on the PCB. The use of vibration-resistant microswitches rules out any shock-induced chattering at the switching contacts.
| Connection | Flat plugs, 6.3 x 0.8 mm, IAW DIN 46244 |
| Microswitches | 3 to 5 included, max. 2.5 mm² IAW IEC 60947 |
| Protection | IP 10 IAW IEC 60529 |
| Vibration stability | > 4 g (20 … 80 Hz), 0.05 bar from switching point |
| Pressure range | 0 … 10 bar rel. / 0 … 145 psi rel. |
| Hysteresis | < 0.1 bar / 1.5 psi (typ.) |
| Switching accuracy | ± 0.08 bar / 1.2 psi |
| Response threshold | ± 0.05 bar / 0.7 psi |
| Reference chamber leakage rate | < 0.005 bar/year (5 * 10-9 mbar * l * s-1) |
| Electric strength | 2 kV (50/60 Hz) to ground |
| Rated surge voltage | 5 kV (1.2/50 μs) to ground IAW IEC 61000-4-5 |
| Electric switch rating, Resistive load (inductive load) |
AC 250 V, 10 (2) A DC 250 V, 0.2 (0.2) A DC 220 V, 0.25 (0.2) A DC 125 V, 0.4 (0.25) A DC 110 V, 0.5 (0.3) A DC 60 V, 1.5 (0.4) A DC 48 V, 1.9 (0.7) A DC 24 V, 3.0 (2) A |
| Operating temperature | –40 … +70 °C / –40 … +158 °F |
| Storage temperature | –50 … +80 °C / –58 … +176 °F |
| Weight | 380 g |
| Material pressure connection and tubular housing | AISi1MgMn, anodized |
| Material reference gas bellows system | Stainless steel 1.4541 (bellows) / 1.4301 (bellows housing) |
