Introduction
The Ludlum Model 9-7 Ion Chamber Display Unit is a digital readout and control unit that can be connected to any compatible ion chamber (sold separately) to provide remote monitoring in high-range beta and gamma fields. This instrument is a direct replacement for the discontinued Eberline Model RO-7, and will work with any of the existing RO-7 series detectors, extensions, and cables.
The gamma measurement range is 0.001 R/hr to 19.99 kR/hr, covered by four separate ion chamber detectors. These ion chambers can be connected either directly to the instrument or via rigid extensions and/or flexible cables to achieve the length required. The detectors will remain functional with extensions/cables up to 152 m (500 ft) in length. The Model 9-7 automatically recognizes which detector is connected so no recalibration or adjustment is required when switching detectors.
The instrument display and controls are very similar to the original RO-7 to minimize any procedural changes or re-training. The backlit LCD displays three easily-readable digits with a floating decimal point to indicate the measurement along the R/hr scale. When connected to the highest range detector, a separate kR/hr indicator is prominently illuminated to warn the operator of the higher scale in use. Controls include a rotary switch for selecting instrument on/off and battery status, an LCD backlight switch (lamp on/off), and a zero adjust knob.
Also Available: Model 9-7-1 (PN 48-3756), a version that displays measurements in Sv/h units.
Note: The Model 9-7 is not RoHS compliant.
Features
- Display Range: 0.001 R/hr to 19.99 kR/hr
- Direct Replacement for Eberline RO-7, Adapts to Existing Eberline RO-7 Detectors
- Digital Readout & Controls
- Backlit Display
- Handle & Folding Tripod Stand
- Separate Battery Compartment
- Detectors Have Removeable Beta Shields
- Waterproof Detector Housing Option
Specifications
COMPATIBLE DETECTORS: Sold separately. Accommodates Ludlum Model 9-7 (see below) and Eberline RO-7 detectors.
DISPLAY: 3½-digit LCD with 1.3 cm (0.5 in.) digits, floating decimal point, and negative sign; backlit illumination controlled by switch.
INDICATORS: Battery OK (green lamp ?), kR/h range active (red lamp ?).
RESPONSE TIME: Approximately 2.5 seconds to 90% of final reading.
CONTROLS: OFF, BAT TEST, ON rotary power switch; LAMP ON-OFF toggle switch (for display backlight); ZERO ADJUST knob.
POWER: Two "D" cell batteries, approximately 160 hour battery life.
TEMPERATURE RANGE: -20 to 50 °C (-4 to 122 °F).
HUMIDITY: 0 to 90%, non-condensing.
CONSTRUCTION: Aluminum housing with beige powder coat, includes carrying handle and folding tripod stand.
SIZE (H x W x L): 24.1 x 9.7 x 23.6 cm (9.5 x 3.8 x 9.3 in.), excluding detector.
WEIGHT: 1.6 kg (3.5 lb), including batteries.
Detectors (available separately)
| Model | Part Number | Range | Resolution |
|---|---|---|---|
| 9-7-BLD | 47-3693-1 | 0.001 to 1.999 R/hr | 0.001 R/hr (1.0 mR/hr) |
| 9-7-BHL-1* | 47-3882-1 | 0.01 to 19.99 R/hr | 0.01 R/hr (10 mR/hr) |
| 9-7-BM | 47-3694 | 0.1 to 199.9 R/hr | 0.1 R/hr (100 mR/hr) |
| 9-7-BH | 47-3696 | 0.01 to 19.99 kR/hr | 0.01 kR/hr (10 R/hr) |
* Note: The Model 9-7 requires modification to use the 9-7-BHL-1 detector.
Options (other cable lengths are available)
- Cable, 4.6 m (15 ft) (PN 8293-689-15)
- Cable, 9.1 m (30 ft) (PN 8293-689-30)
- Cable, 18.3 m (60 ft) (PN 8293-689-60)
- Cable, 30.5 m (100 ft) with Kellems grip (PN 8293-689-100GR)
- Cable, 61 m (200 ft), with Kellems grip (PN 8293-689-200GR)
- Rigid Detector Extension, 0.6 m (2 ft) (PN 4293-843)
- Rigid Detector Extension, 1.5 m (5 ft) (PN 4293-844)
- Detector Underwater Housing with 18.3 m (60 ft) cable (PN 4536-046)
- Detector Underwater Housing with 30.5 m (100 ft) cable (PN 4536-047)
Visual Descriptions
Image 1: A Ludlum Model 9-7 Ion Chamber Display Unit is shown. It is a beige, rectangular device with a carrying handle and a folding tripod stand. A detector is connected via a cable. The front panel features a rotary control knob, a toggle switch, and a backlit LCD display. The unit is labeled "LUDLUM MEASUREMENTS INC. MODEL 9-7 ION CHAMBER".
Image 2: Two smaller images are displayed. The left image shows the control panel with a rotary switch labeled "OFF", "BAT TEST", "ON", and a toggle switch labeled "LAMP ON-OFF", along with a "ZERO ADJUST" knob. The right image shows the digital display reading "01.3" with indicators for "kR/hr" and "R/hr".
Image 3: A Ludlum Model 9-7 Ion Chamber Display Unit is shown connected to a detector. The unit is beige, with a handle and tripod stand. This image is captioned "Model 9-7 with Detector (available separately)".
Image 4: A close-up of a "Model 9-7-BM Mid-Range Ion Chamber" detector is shown. It is a cylindrical device with a silver-colored metal housing and a black tip, connected to a cable.
Image 5: An "Underwater Housing for Model 9-7 Detector" is depicted. It is a silver-colored cylindrical unit with a cable attached, standing upright on a black base.
