Specifications:
1. Insertion Resistance Thermometer: Models WBV 1R and WBV 2R are designed for direct mounting on differential pressure transmitters GPM. They feature Pt100 measuring resistors according to DIN 43760 with 1/3-DIN tolerance, fast response, and PTB approval up to 160 °C, with a maximum temperature of 250 °C. The thermometer includes a light metal connection head and a protective tube made of X10CrNiMoTi 1810.

2. Heat Meter WR90: This microcontroller-controlled electronic device measures heat and flow quantities with 7-digit electromechanical counters. It displays forward and return temperatures, delta T, k-value, flow, and heat power on a 4-digit LED display. It meets PTB requirements with a measurement error of less than 1.5% for delta T 3...20 °C and less than 1.0% for delta T 20...200 °C. It includes 4 analog outputs and impulse outputs for heat and flow quantities.

Procedures:
- The device operates with a supply voltage of 230 V 50 Hz or 24 V 50 Hz and is available as a panel-mounted or wall-mounted device.

Standards and Approvals:
- PTB approval for the thermometer and compliance with PTB requirements for the heat meter.

Recommendations:
- Ensure proper installation and calibration to maintain accuracy within specified error margins.

Key Data from Tables:
- Insertion Length and Weight: WBV 1R: 160 mm, 0.5 kg; WBV 2R: 250 mm, 0.6 kg.
- Impulse Outputs: Maximum contact load of 30 V, 0.5 A.
- Dimensions: Panel device: 144 x 72 mm, depth 220 mm; Wall device: 180 x 240 x 295 mm, IP 65 protection.