Mastercool 52228 — Digital Differential Thermometer

Professional digital differential thermometer provides instant measurements of TWO points (T1, T2) and T1-T2 differential. Features max hold function, data hold, dual units (°F/°C), and AUX output jacks. Wide temperature range -50°F to 1999°F (-50°C to 1300°C) with 1° resolution. Includes two 3ft Type K thermocouple probes. Essential diagnostic tool for HVAC/R technicians.

Key Features:

• Dual Type K Inputs – Measure two temperatures simultaneously (T1, T2)
• Differential Display – Shows T1, T2, and T1-T2 difference
• Max Hold Function – Captures maximum temperature reading
• Data Hold Function – Freezes display for recording
• Temperature in °F or °C – Switchable units
• AUX Output Jacks – Connect to external devices
• Wide Range – -50°F to 1999°F (-50°C to 1300°C)
• 1° Resolution – Precise measurements
• Two 3ft Probes Included – Ready to use out of the box
• Type K Thermocouple Input – Industry-standard sensors

Specifications:

• Model: 52228
• Type: Digital differential thermometer
• Inputs: Type K thermocouple (T1, T2)
• Temperature range: -50°F to 1999°F (-50°C to 1300°C)
• Resolution: 1°F (1°C)
• Display: T1, T2, and T1-T2 differential
• Units: °F and °C (switchable)
• Functions: Max hold, data hold
• AUX output: Yes (output jacks included)
• Probes included: 2 x 3ft Type K thermocouples
• Power: Battery operated
• Weight: 10 kg (shipping weight)
• SKU: 52228
• HS Code: 90251180

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• 99946-BT — SPARTAN Digital 4-Way Manifold with Temperature Clamp

Applications:

• Evaporator temperature differential measurement
• Condenser performance testing
• Heat exchanger efficiency testing
• Superheat and subcooling calculations
• Air conditioning system diagnostics
• Refrigeration system performance
• Heat pump testing
• HVAC commissioning
• Data logging via AUX output

What is Differential Temperature?

Differential temperature is the difference between two temperature measurements. In HVAC/R work, measuring temperature differential across components helps diagnose system performance. For example, measuring air temperature entering and leaving an evaporator coil shows how much cooling is occurring. The 52228 automatically calculates and displays this difference (T1-T2) whilst showing both individual temperatures.

Common HVAC/R Differential Measurements:

• Evaporator Air Split – Temperature difference across evaporator coil (typically 15-20°F)
• Condenser Air Split – Temperature difference across condenser coil
• Superheat – Temperature difference between suction line and evaporator saturation temperature
• Subcooling – Temperature difference between liquid line and condenser saturation temperature
• Heat Exchanger Efficiency – Temperature change across heat exchangers

How to Use:

1. Connect Type K probes to T1 and T2 inputs
2. Select °F or °C units as needed
3. Place T1 probe at first measurement point
4. Place T2 probe at second measurement point
5. Read T1, T2, and T1-T2 differential on display
6. Use Max Hold to capture peak temperatures
7. Use Data Hold to freeze display for recording
8. Connect AUX output to data logger if needed

Benefits:

• Instant Measurements – See T1, T2, and differential immediately
• Automatic Calculation – No manual maths required for T1-T2
• Wide Range – -50°F to 1999°F handles all HVAC/R measurements
• 1° Resolution – Precise, accurate readings
• Dual Units – Switch between °F and °C as needed
• Max Hold – Captures peak temperatures during system operation
• Data Hold – Freeze display for easy recording
• AUX Output – Connect to data loggers or recorders
• Probes Included – Ready to use immediately
• Professional Quality – Accurate, reliable measurements

Why Measure Temperature Differential?

• System Performance – Verify cooling or heating capacity
• Airflow Verification – Low differential indicates poor airflow
• Refrigerant Charge – Helps diagnose overcharge or undercharge
• Component Efficiency – Test heat exchanger performance
• Troubleshooting – Identify system problems quickly
• Commissioning – Verify new installations meet specifications

AUX Output Jacks:

The AUX output jacks allow you to connect the 52228 to external data logging equipment, chart recorders, or other monitoring devices. This enables continuous temperature monitoring and recording for long-term performance analysis or commissioning documentation.

Maintenance:

• Keep probes clean and free from debris
• Store probes carefully to prevent damage
• Replace batteries when low battery indicator appears
• Calibrate periodically for accuracy
• Protect from impact damage
• Store in protective case when not in use

What's Included:

• 52228 Digital differential thermometer
• 2 x Type K thermocouple probes (3ft length)
• Battery
• User manual

Professional Quality: Mastercool digital differential thermometers are built to professional standards for accurate, reliable temperature measurement in demanding HVAC/R service environments. Essential diagnostic tool for system performance testing.