Source: https://guthlabs.ai/docs/instruments/relative-humidity-dew-point-converter/implementation/

instrument implementation / implementation-contract

# Relative Humidity ↔ Dew Point Converter implementation

A source-bound implementation contract for Relative Humidity ↔ Dew Point Converter; deployment and executable qualification remain separate.

Status: **VERIFIED_CLEAN**Lifecycle: **implementation-contract**

## Binding contract

This record describes what an executable surface must bind and validate. It does not claim that a public calculator, package, or production route is deployed.

**Record owner**: Guth Instruments

**Lifecycle**: verified-clean

**Evidence ID**: t4-048

**Effect**: Computation or source lookup only

## Input and validation requirements

The formula has an undefined RH=0 input that requires validation, and an unlabeled RH value such as 0.5 can produce either 9.25519°C or −44.60415°C depending on percent-versus-fraction convention.

## Required corrections

No binding erratum is attached to this unique-name record. Implementers must still preserve the declared units, domain, and failure behavior.

## Inspectable interface fixture

The sample below is evidence for interface and validation tests, not a production implementation.

````
{
  "inputs": {
    "dry_bulb_temperature_C": 20,
    "relative_humidity_percent": 50
  },
  "expected_outputs": {
    "dew_point_temperature_C": 9.2552
  },
  "working": "γ=ln(50/100)+(17.62×20)/(243.12+20) = ln(0.5)+352.4/263.12 = -0.693147+1.339313 = 0.646166. Td=243.12×0.646166/(17.62-0.646166) = 157.0958/16.973834 = 9.2552°C."
}
````

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/relative-humidity-dew-point-converter/>)[02**Mechanism**](<https://guthlabs.ai/docs/instruments/relative-humidity-dew-point-converter/mechanism/>)[04**Qualification**](<https://guthlabs.ai/docs/instruments/relative-humidity-dew-point-converter/qualification/>)

## Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

- `VERIFIED_LEDGER.json`

- `evidence-tranche4/tranche4-results.json`