S904 / S904-D
Michell Instrument
The S904 is a completely stand-alone and transportable calibrator for humidity sensors, requiring no external services other than mains power. The calibration chamber features 5 interchangeable ports to accommodate virtually any brand, type or model of sensor. This calibrator is ideal for companies or organizations looking to calibrate large numbers of probes in a laboratory or fi eld setting.
The environment within the insulated calibration chamber is temperature controlled using a 4-zone fanassisted Peltier arrangement for maximum stability, and minimum temperature gradient. The humidity of the circulating air is precisely regulated using a closed-loop control system that functions by proportionally mixing flows of dry and saturated air.
Two highly visible LED panels on the front of the S904 display the current humidity and temperature within the calibration chamber. The response time to a humidity or temperature step change is typically less than 10 minutes, so a simple 3-point calibration can be carried out in under an hour.
With the S904D version, the humidity and temperature set points of the chamber can be controlled with the supplied PC application software, enabling the operator to create completely automated calibration profi les for unattended laboratory operation. The software also gives the ability to monitor, chart and log data from the connected probes and calibration reference on a PC for later analysis. Alternatively, the set points can be controlled manually with the front panel controls – making the S904 ideal for fi eld calibrations where a PC is not available.
Highlights
- Simple operation and maintenance
- Excellent chamber stability and uniformity
- Manual control or optional straightforward automated set point programming
- Optional in-built data-logging for reference probe and probes under calibration
Applications
Calibration – Pharmaceuticals – Produce/Meat/Dairy – Chemicals – Laboratories
S904 / S904-D |
|
| Humidity | |
| Generation range | 10–90% RH |
| Accuracy control element | ±1% RH (10.70% RH) ±1.5% RH (70.90% RH) |
| Stability | ±0.2% RH (20–80% RH) |
| Temperature | |
| Generated range | +10 to +50°C (+50 to +122°F)
(lowest T set point = 10°C (18°F) below |
| Accuracy | ±0.1°C (±0.2°F) |
| Stability | ±0.1°C (±0.2°F) |
| Chamber | |
| Ramp rate from +20 to +40°C (+68 to +104°F) +40 to +20°C (+104 to +68°F) |
1.5°C / minute (2.7°F / minute) 0.7°C / minute (1.2°F / minute) |
| Control element | Removable relative humidity sensor |
| General | |
| Probe ports | up to 5 – sensor body diameters 5 to 25mm (0.2 to 0.98″) accommodated by port adapters |
| Chamber volume | 2000cm3 (122.1in3) |
| Chamber dimensions | 105 x 105 x 160mm (4.13 x 4.13 x 6.3″) (h x w x d) |
| Instrument dimensions | 290 x 520 x 420mm (11.4 x 20.5 x 16.5″) (h x w x d) |
| Set point resolution | 0.1 for humidity and temperature |
| Displays | 3 digit LED, 10mm (0.39″) characters |
| Supply | 85 to 264 V AC, 47/63 Hz, 150 VA |
| Weight | 20kg (44lbs) |
- Overview
-
S904 / S904-D
Michell Instrument
The S904 is a completely stand-alone and transportable calibrator for humidity sensors, requiring no external services other than mains power. The calibration chamber features 5 interchangeable ports to accommodate virtually any brand, type or model of sensor. This calibrator is ideal for companies or organizations looking to calibrate large numbers of probes in a laboratory or fi eld setting.
The environment within the insulated calibration chamber is temperature controlled using a 4-zone fanassisted Peltier arrangement for maximum stability, and minimum temperature gradient. The humidity of the circulating air is precisely regulated using a closed-loop control system that functions by proportionally mixing flows of dry and saturated air.
Two highly visible LED panels on the front of the S904 display the current humidity and temperature within the calibration chamber. The response time to a humidity or temperature step change is typically less than 10 minutes, so a simple 3-point calibration can be carried out in under an hour.
With the S904D version, the humidity and temperature set points of the chamber can be controlled with the supplied PC application software, enabling the operator to create completely automated calibration profi les for unattended laboratory operation. The software also gives the ability to monitor, chart and log data from the connected probes and calibration reference on a PC for later analysis. Alternatively, the set points can be controlled manually with the front panel controls – making the S904 ideal for fi eld calibrations where a PC is not available.
Highlights
- Simple operation and maintenance
- Excellent chamber stability and uniformity
- Manual control or optional straightforward automated set point programming
- Optional in-built data-logging for reference probe and probes under calibration
Applications
Calibration – Pharmaceuticals – Produce/Meat/Dairy – Chemicals – Laboratories
- Technical Specifications
-
S904 / S904-D
Humidity Generation range 10–90% RH Accuracy control element ±1% RH (10.70% RH)
±1.5% RH (70.90% RH)Stability ±0.2% RH (20–80% RH) Temperature Generated range +10 to +50°C (+50 to +122°F) (lowest T set point = 10°C (18°F) below
ambient)Accuracy ±0.1°C (±0.2°F) Stability ±0.1°C (±0.2°F) Chamber Ramp rate from
+20 to +40°C (+68 to +104°F)
+40 to +20°C (+104 to +68°F)1.5°C / minute (2.7°F / minute)
0.7°C / minute (1.2°F / minute)Control element Removable relative humidity sensor General Probe ports up to 5 – sensor body diameters 5 to
25mm (0.2 to 0.98″) accommodated by
port adaptersChamber volume 2000cm3 (122.1in3) Chamber dimensions 105 x 105 x 160mm (4.13 x 4.13 x 6.3″)
(h x w x d)Instrument dimensions 290 x 520 x 420mm (11.4 x 20.5 x 16.5″)
(h x w x d)Set point resolution 0.1 for humidity and temperature Displays 3 digit LED, 10mm (0.39″) characters Supply 85 to 264 V AC, 47/63 Hz, 150 VA Weight 20kg (44lbs) - Downloads
